Meme deck, but pretty reliable. An alternative take to Quest Mage.

You can use this deck to reach Rank 5. No promises above that rank though due to so many aggro archetypes.
Favorable against any Control. Big Priest is autowin.

COMBO

This deck has only one strategy to win. Stay alive, complete your quest, OTK from hand. The earliest this combo can be performed is on turn 9.

The minimum combo cards are: Time Warp, Archmage Vargoth, Greater Arcane Missiles, and at least 1 Molten Reflection. With these cards, you will get 45 damage.
Drakkari Enchanterboosts the combo above, dealing 81 damage finishing blow, enough to kill most decks.
Alternatively, you can use another Molten Reflection to boost the combo, dealing 63 damage.
The over the top combo though, will use all cards (Time Warp, Archmage Vargoth, Greater Arcane Missiles, 2xMolten Reflection), and Drakkari Enchanter). This deals 117 damage.

To properly get maximum damage, make sure there's no other minion on your board before performing the ritual.

First Turn: Play Time Warp and Archmage Vargoth, then go Extra Turn. If on turn 10, do not ruin Vargoth effect by spending 1 mana left on another spell.

Second Turn: Play both Molten Reflection on Archmage Vargoth, or one if that's what you got. You can use leftover mana for hero power. Do not use that for any spells or minions, so you don't ruin Vargoth effect on copying itself. You can attack minion/face using Vargoth this turn, just don't let this minion die. Hit Extra Turn, now you have 6 (if using both Reflection) or 4 Vargoths (if using only one Reflection).

Third Turn: Play Greater Arcane Missiles, Additionally you can play Drakkari Enchanter this turn. Again, you can attack minion/face using Vargoth this turn, just don't let him die. Finish your turn. 

Alternatively you can play another weaker combo around Arcane Giants and Conjurer's Calling. With help of Time Warp, you can get lethal damage, but only if your opponent doesn't have taunts.

MULLIGAN

Basically, pick cards that helps you towards finishing your Quest. It's your only win condition. Stay alive while doing so.

vs Control/Combo you can play slower, keep Coldlight Oracle and Research Project. Use those cards to burn their combo/important cards.

vs Aggro this deck is fairly vulnerable. You need to stall until you get all your combo pieces. Keep Frost Nova and Blizzard. You can also keep Ice Blocks.