Tira, Crestfallen Huntress

Crestfallen Huntress enters the battlefield with a
+1/+1 counter on it for each artifact, hunter or
huntress card on the battlefield.
As long as it is not your turn, spells you cast cost
1 less
Im Not Quite Sure What It Means To Mourn, Or
Even If We Have A Soul To Concern Ourselves With.
But I Hope Youre At Rest