Yumi, Knight of Adaptation

Convoke
Whenever you play a wolf creature, you may
choose to pay {g} or {u} . If you pay {g}, gain
+2/+0 and Trample. If you pay {u}, gain +0/+2
and Vigilance. This can only be done at Night
and lasts until the end of your opponent's turn.
I've learned what survival means. It means to
changing for the situation. If I need to change from a
knight to something faster and stealthier, I will. Eventually my wolf will learn this, and will grow alongside me.