Harmonium

Sustain 5 (This card gets 5 counters. Whenever you
are dealt damage, remove one. If there are none,
remove it from the game).
Whenever you cast a white spell, Fleet 1. (Put a
+1/+1 counter on a fleet you control. If you don't
control one, create a 0/0 colorless Space Fleet token
with Starflight first.)
{t}: Add {w}{w} to your mana pool.