Elesh Norn, Ascendant

({p/w} can be payed with either {w} or 2 life.)
Hexproof, Vigilance
For each {w} in a cost, you may pay 2 life rather
than pay that mana.
Whenever you cast a white spell, gain control of
target creature, or planeswalker, it becomes an artifact in addition to it's other types.