Resilient Leonin

Flash
When Resilient Leonin enters the battlefield, put
a +1/+1 counter on target attacking creature.
That creature gains first strike and lifelink until
end of turn.
Recur {1}{w}{w} (You may cast this spell from your graveyard for its recur cost. If you do, it's sacrificed
when it enters the battlefield. Recur only once each
turn.)