Ren, Shrieking Explorer

When Ren, Shrieking Explorer enters or attacks,
put a stun counter on target creature.

Whenever a stun counter is put on another creature, Ren, Shrieking Explorer explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put that card back or put it into your graveyard.)