Dragonhawk, Fate's Tempest will exile cards when it enters or attacks and if you don't end up using them, it will push damage out to each opponent
Sludge Monster is an odd way to remove threats, but it does it incredibly well, and if you can then copy it as well, youll be laughing
Mystic Remora: Draws cards in multiplayer games, making the alternate cost easier to support
While both are interesting to build around, Wakka lets us blend the two strategies - without restricting us to creature type or color identity
Her +1 loyalty ability gains her loyalty equal to the number of creatures you control, so if you've got enough creatures on the battlefield you can set up ticking down her ultimate on the very next turn
Legendary Creature - Human Soldier Resurgent Belief Suspend 2 (Rather than cast this card from your hand, pay and exile it with two time counters on it