Might sneak into Dude decks with Lothraxion, but not sure if Paladin gets a wide enough board of Divine Shield minions to kill your opponent otherwise.
Here's my first idea. The flavor is nice, but it might be a bit unoriginal, so I intend to come up with a second option.
Edit: As promised, here's something a little more interesting. I'm open for suggestions.
I'm back! Didn't mean to go silent for so long. I don't always feel like joining feedback and decided I don't need to participate every week... Cue me not having a lot of inspiration for the prompts and skipping multiple weeks in a row, which I might regret once the season is over. Then I got a little busy irl, so my break took longer than expected. Still submitted a few decent cards in the meantime.
I can only really think of specific scenario where this is better than Potion of Illusion, and that's with 8 mana Astalor into Prep, Bounce, play Astalor again for 1 mana.
Hello, hello, oh HELL-NO!!! Crown piece of Kangor/Big Paladin decks, though I think playing this off of Blood Crusader is a bit risky in certain match ups.
Ironically, the Hero Power Druid deck might not be the best performing place for this card, but in a Anub deck to make a pair of giant taunts that few aggro decks can get around. Or they're the same deck, and this is just the nuts.
A conditional... Fire Fly... Granted, Fire Fly didn't make itself infinitely, but the tribe and the effect seems a bit at odds with each other, to say the least.
So we're rotating out Vanessa Vancleef and getting a similar (though less targeted/specific) effect but without the body. Thief Rogue didn't run Vanessa often in the first place, but losing out on premium cards like Recon just might make the case.
On the Dissonant sid, a 5 mana 6+/6+ minion doesn't sound too bad... but no class bias, so you kind of have to pray that you get a decent keyword or effect. But a card that's only good half of the time doesn't really see play, see also Worgen cards from Witchwood.
New Paladin Spell - Spotlight
5 stars for the 5/5.
New Demon Hunter Spell - Going Down Swinging
Feels bad that Fury is leaving and that Twin Slice isn't returning to help this out.
New Neutral Minion - E.T.C., Band Manager
Apparently this is a hot take, but ETC as a Tech Toolbox is bad, garbage even.
New Paladin Minion - Kangor, Dancing King
Your opponent will be praying that they have Silence or Transformation effects, otherwise you're pulling big boi after big boi into play.
New Paladin Minion - Lead Dancer
Possessed Lackey... Without a Dark Pact to pair with her. Excuse me, but I feel a little doubtful that this is good.
New Paladin Minion - Jitterbug
If nothing else is A draw, but it's a slow draw at that.
New Paladin Minion - Funkfin
Might sneak into Dude decks with Lothraxion, but not sure if Paladin gets a wide enough board of Divine Shield minions to kill your opponent otherwise.
Numerical Value - Card Design Competition Discussion Thread
Here's my first idea. The flavor is nice, but it might be a bit unoriginal, so I intend to come up with a second option.
Edit: As promised, here's something a little more interesting. I'm open for suggestions.
I'm back! Didn't mean to go silent for so long. I don't always feel like joining feedback and decided I don't need to participate every week... Cue me not having a lot of inspiration for the prompts and skipping multiple weeks in a row, which I might regret once the season is over. Then I got a little busy irl, so my break took longer than expected. Still submitted a few decent cards in the meantime.
New Demon Hunter Weapon - Glaivetar
Honestly, I'd be worried about decking myself in Outcast DH, but that just seems like an embarrassment of riches at that point.
New Rogue Spell - Breakdance
Having a decent body and good effect you want to bounce is usually mutually exclusive.
New Rogue Minion - Beatboxer
I'm wondering if Miracle is really the route we want to go with Combo-Bounce Rogue, if we get there just going for Tempo...
New Rogue Spell - Bounce Around (ft. Garona)
I can only really think of specific scenario where this is better than Potion of Illusion, and that's with 8 mana Astalor into Prep, Bounce, play Astalor again for 1 mana.
New Paladin Minion - Annoy-o-Troupe
Hello, hello, oh HELL-NO!!! Crown piece of Kangor/Big Paladin decks, though I think playing this off of Blood Crusader is a bit risky in certain match ups.
New Neutral Minion - Tony, King of Piracy
I want this to be bad, because I don't want to play in a meta where Tony Warrior is actually good.
New Demon Hunter Spell - Taste of Chaos
Man, just as Jace is rotating out too. Fel Spells are okay in DH, you can honestly run it to juice up S'theno.
New Demon Hunter Minion - Guitar Soloist
Interesting conditional Tutor, but I'm not sure what weapon you want to target, nor the minions. Not sure if this makes the cut in say Relic DH.
New Druid Minion - Zok Fogsnout
Ironically, the Hero Power Druid deck might not be the best performing place for this card, but in a Anub deck to make a pair of giant taunts that few aggro decks can get around. Or they're the same deck, and this is just the nuts.
New Shaman Spell - Chill Vibes
Seems good for a Presence Shaman deck, giving you a body and recovering the health lost from earlier turns.
New Warrior Weapon - Kodohide Drumkit
Another reason why they took Armorsmith out of Core Set before Armor Warrior got a chance to be a thing.
New Shaman Minion - Saxophone Soloist
A conditional... Fire Fly... Granted, Fire Fly didn't make itself infinitely, but the tribe and the effect seems a bit at odds with each other, to say the least.
New Rogue Spell - Mixtape
So we're rotating out Vanessa Vancleef and getting a similar (though less targeted/specific) effect but without the body. Thief Rogue didn't run Vanessa often in the first place, but losing out on premium cards like Recon just might make the case.
New Paladin Weapon - Disco Maul
Play 1 minion and this is better than Warrior's Woodcutter Ax. Common Paladin W
New Paladin Spell - Boogie Down
1 cost minions aren't as exploitable as 2 cost ones, and it's only two of them not three. Call to Arms, this is not.
New Paladin Spell - Harmonic Disco
On the Dissonant sid, a 5 mana 6+/6+ minion doesn't sound too bad... but no class bias, so you kind of have to pray that you get a decent keyword or effect. But a card that's only good half of the time doesn't really see play, see also Worgen cards from Witchwood.
New Druid Spell - Harmonic Mood
I like the art on the Dissonant side, very ANCIENT SINS vibe there.

Is it a good card? Eh, don't think so.