Kiora's Dambreaker 
Creature — Leviathan
When this creature enters, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL