Ostara, Nature's Arcanist

Flying, Ward {3}
When Ostara, Nature's Arcanist, enters the battlefield, create a 1/1 black Crow
token with flying and vigilance.
Whenever you cast an instant or sorcery spell,
place a +1/+1 counter on Ostara, Nature's Arcanist.
Remove a +1/+1 counter from Ostara: Target creature gets hexproof until end of turn.