Gwen, Hallowed Seamstress

Gwen can’t be blocked by creatures with
power 3 or greater.

Whenever Gwen deals combat damage to a
player, exile the top card of that player’s
library. You gain life equal to that card’s
mana value. Until end of turn, you may cast
that card and you may spend mana as though
it were mana of any color to cast that spell.

"Stitched with purpose."