Three: Tuskarr Totemic
I hate this card with a burning passion. Three mana, 3/2, text reads: “You have a 3/7 chance of winning the game”. There are only seven totems in Standard, and three of them are massively game changing. If this guy gets Mana Tide Totem, Flametongue Totem, or worst of all, Totem Golem, suddenly he has played five or six mana worth of stats, on turn three. And it was a simple roll of the die. The worst part is, if he does lose the dice roll and gets one of the four basic totems, it’s still not bad, it’s four mana worth of stats for three mana. Cards like this are the reason that Piloted Shredder was a massive problem, because even in most awful scenarios, it was still better than it should have been, and in good scenarios it simply wins the game on the spot. This card even got a buff with Standard since Vitality Totem rotated out. Also, it synergizes with Thing from Below, another incredibly powerful Shaman card. Tuskarr Totemic has literally no downsides, and its upsides are beyond broken, based entirely on a coin flip.