Oko, the Trickster [The List]

[+1]: Put two +1/+1 counters on up to one target creature you control.

[0]: Until end of turn, Oko, the Trickster becomes a copy of target creature you control. Prevent all damage that would be dealt to him this turn.

[-7]: Until end of turn, each creature you control has base power and toughness 10/10 and gains trample.