Wei, White Mana Incarnate

Flying, First Strike, Vigilance, Indestructible
When Wei enters the battlefield or at the beginning of your upkeep, put an Incarnation counter on Wei.
Whenever you gain life, you may pay {w}, if you do create a 1/1 white spirit creature token with flying.
Remove an Incarnation counter from Wei: Gain 3 life, or create 3 1/1 white spirit creature tokens with flying, or exile target creature.