Ose, The Relentless Fool

Double strike, haste
When Ose, the Relentless Fool enters the battlefield,
each creature on the battlefield gains +1/+1 and
attack for each combat if able until their controllers
next end step. When Ose, The Relentless Fool
leaves the battlefield, each creature you control
gains a +1/+1 counter. this ability triggers only
once per turn.