Seven, Last of the Vae'vyn

Dash {1}{r}
Seven gets +X/+0, where X is the number of
times you've returned a card named Seven, Last
of the Vae'vyn to your hand this game. If X is 3
or more, Seven has flash. If X is 5 or more, Seven
has trample. If X is 7 or more, Seven gets an additional +X/+0.