Uren, the Inevitable

Convoke
Flying, Lifelink, ward {x} where X is the number
of clerics you control.
Uren gets +1/+1 for each cleric you control.
Forecast—{w}{w}, Reveal Uren from your hand:
Create a 1/1 white cleric creature token. this
ability costs {1} more to activate for each cleric
you control.