Bolnga, Cosmic Interloper

+2: Each creature you controls gets +1/+1. If it already has a +1/+1 counter on it, double that many counters on it instead.
-X: Each player loses X life and you gain X life, where X is how many colorless creatures you control
-7: You get an emblem that says, "When a non-legendary creature you control deals combat damage to a player, make a copy of it."