Nun, Harbinger of Anui-El

Lifelink, defender
Whenever a creature is sent to your graveyard
from anywhere, gain X life from that creature's toughness. Whenever you cast a creature, you
may pay {1}{w}{g}. If you do, create a copy of that creature and it has haste.
{x}{3}{w}{g},{t}: Populate X times, where X is the
amount of mana spent.
Partner (You can have two commanders if
both have partner.)