My main issue is the name, which is basically a watered down version of the original card's name. I'd try something like Overspark, Overdrived or something like that.

Wailor: I like it. It maintains the flavor of the original while still being its own thing. Might be too dangerous late game, but I think that's okay given the condition and the fact only one Fireball could be played that same turn.

linkblade91: This card reads weird. It wants to be a "For the rest of the game…" but has to have the other text regarding costs on it as well. Maybe make it like the Rogue quest and have it add a card to your hand. This would shorten the text as well. Spreading Saplings exists, so maybe just add that (or variant) to the hand.

R: My favorite so far. This also maintains the flavor of the original. It would be nice to have the 5/5 effect in there as well, but I understand text limitations prevents that. Great!

anchorm4n: I don't like the Pitch-Black Knight. Way too OP. The effect for Indiana Ford is great and very fitting for a remake of a Harrison Jones with restrictions. While I understand the name, it's off-putting for Hearthstone since the other has a precedent in WoW. That said, this is just a Card Design Competition and not actual Hearthstone so it's quite alright.

DestroyerR: Card is perfectly fair as is. This isn't a critique of your card, but if I were designing it, I think I would keep the Start of Game effect and have it be the next card drawn so it's as if Leeroy is charging to the front of the deck. Dumb, maybe, but flavorful haha.

Demonxz95: In the current Standard set, that would only leave 2 weapons Headhunter's Hatchet and Trueaim Crescent. I think it could keep the flavor of a NE Ranger if it said something like "add 2 random Hunter Shots to your hand." similar to how Poisons became a thing for Rogue. List of Standard Shots 

This version of the Wise Old Ant is both fun, competitive, and succinct, which is lovely. I like the 4-cost one best, if only because 3-mana 2-4 is a well-traveled road for Mage. A 4-mana 2-7 feels more impressive.

Your change was a good one, I think. The new version allows a more flexible gameplan and is more in-line with the direction they're pushing Druid. That said, though, the effect seems very strong. Druid can bash out 2-4 spells a turn easily - imagine having this dude down on turns 1-4 and then continuing? Thankfully there's no Savage Roar these days, but still, that's scary - the sort of game-defining scary that Classic legendaries should be, which is why I'm torn. More powerful is always better, so I'd go with it, unless you can think of an artful way to tune the card down.

Already in. Thoughts, though - this card, like some others, feels like the Barrens Kazakus - it's not something you'd build around, but if there are only two or three 3-cost cards in your deck, why not cut them for the powerspike? Neutral cards with that sort of 'well, why not include it?' feel are the sort that can ruin expansions. Thankfully, Barrens Kazakus is quite interesting and 4-mana is a tough slot, so it's alright. Master Overspark isn't as interesting, though, so doesn't feel worth the risk. It's a neat card, and a fun one, but not something I'd want to see in the game.

Indeed, destroying all of your opponent's anything is scary! It makes sense to bring Sylvanas back as a Hunter card, though, given the hero skin - that's an exciting sort of boldness. The effect is bland at the moment, though. If a 3-mana card that triggers Deathrattles doesn't see play, would this one? Perhaps, admittedly, but I'm more wary than excited. There should be another way to retrofit Sylvanas' flavor (mucking with your opponents minions) with Hunter. A Freezing Trap-esque effect? Maybe a Hysteria-like effect where you choose an enemy minion to attack the others? You could do a lot in that arena - choose an enemy minion and its attack and health explode, are stolen, distributed among your minions, an effect activates for each ATK or HP, etc.

This is hilarious. I wouldn't label it a winner, because at end of day he's just a mediocre Rush minion, but the combination of effect, art, and history are more than enough for me to give 4 stars anyway. Maybe tweak it elegantly with flavor in mind, but if not, go! Live the dream!

Admittedly, much as I appreciate that you've taken a new direction, it's hard to swallow such a radical shift for a character that we're familiar with. I'd love if she were one of several cards that told the story of Classic legendaries through re-imaginings, but that's beyond the scope of the competition. To really sell me on the idea, I think that either the effect should be cooler or there should be some callback to Classic Sylvanas. Maybe you could work minion muckery into the card, somehow? "Give a weapon x attack for x enemy minions." is a dumb, overpowered idea, but it could be an avenue. "Destroy an enemy minion. Its ATK and HP become your weapon's ATK and Durability for a turn." … actually, that's badass. Part of me wants to steal it for my own use!

The token rule really disappoints me, because your original idea is my favorite design so far. Admittedly, no relation to the original besides a tribal tag, but he's just so TOOTHSOME! Who cares if immune effects have an evil history in every other card game I know? I want it. I want my majestic, impenetrable storm daddy.

Cough. Anyway. Thalnos. Is Thalnos a Warlock in WoW? As a Hearthstone-exclusive chump, this feels odd. He's a tough card to reimagine, since the original effects are so basic and succinct (same with Al'Akir, actually. You choose tough cookies!), but I think there ought to be more connection to the original than there is now. Your current effect feels niche and broken. If you continue down this path, perhaps you could have him play into the self-damage aspect of Warlock instead - something like "Your Hero Power costs 0. Cards you draw this turn have Spell Damage +1." or "Activate your Hero Power twice." My general thought is that he should be, like the original, an all-around useful card that helps Warlock do Warlock things a l'il more easily or efficiently, rather than a deck-definer or a finisher. If you do want to be bold and create a finisher, I'd play to the draw or spell damage aspects - two ideas could be, "Deal 1 damage to your opponent whenever you draw a card." or "Gain +1 Spell Damage whenever you draw a card. If your deck has no 2-cost cards, your Hero Power costs (0) this turn."

That's a lot. Sorry. I have too much free time at the moment, obviously!

Lundy: Thalnos is simple but useful, I like it.

Anchorm4n: This could be a pretty powerful card, although something about the ability doesn't fit for me.

Me0203: Out of the three, I'd say Gruul is the most interesting.

Wailor: I'd go with the 4-Mana version.

linkblade91: You might want to increase the mana cost to 6 or 7, this is a pretty powerful card early and it's not hard for Druid to get to 5 mana early enough for this to have a big impact

Demonxz95: Pretty powerful effect if you build your deck right, I like it.

DestroyerR: Good card. I kinda wish this still had Charge, but that's just me (it would be completely broken with it).

R: Simple but effective and good flavor.

Longshadow:  I like the flavor of Professor Jones, although the spells should probably cost 5 Mana.

Ahem, in all seriousness, I really like your neutral version of The Banshee Queen. I prefer the second wording, since it's more clear.

Also, I think the name is great, even if it doesn't contain the word "Sylvanas". She is a pretty recognisable character, so I doubt people would downvote you for that.

Anchorm4n: Go with the second version, it's more clear and still fits in the box. I like the new angle for the card.

Alfi: Ridiculously overpowered currently. Switch to Rush, lower the base stats, and / or change the mana requirement.

Lundy: Maybe make it say "replace your hero power with [insert name here]", and include a token with a new hero power with the original text plus the spell damage. I still prefer the first version you showed, but this one does have more connections to the original Thalnos.