Smothering Tithe is an enchantment card that many despise as it forces your opponent to pay two mana whenever they draw a card for the rest of the game, but if they refuse to, you get to create a Treasure Token
Dark Depths (Counters Legendary Land) An infamously powerful land, [c]Dark Depths[/c] aims to remove all ten of the ice counters it enters with
Unlike some other cards on our Top 5 list, Stoneforge Mystic is played in a multitude of decks ranging from Hammertime to Azorius Control and he is brilliant everywhere
Gimmicky planeswalkers are ones that have a twist to them, only having negative abilities, maybe being an uncommon walker, a nonlegendary one, one centered around only zeroes, one that transforms, one that has a plus that can get it to an ult directly by adding loyalty counters, etc
As always I'm going to recommend doubling extra turns