Capricopian

Creature — Goat Hydra

Capricopian enters with X +1/+1 counters on it. : Put a +1/+1 counter on Capricopian, then you may reselect which player Capricopian is attacking. Only the player Capricopian is attacking may activate this ability and only during the declare attackers step. (It can't attack its controller.)