Witch Mercy

Flying, Hexproof, Exalted
Whenever a creature dies, put a +1/+1 on Witch Mercy until end of turn.
{3} Any creatures that attack alone get a +2/+2 in addition to all exalted cards.
Whenever Witch Mercy receives damage. She gains Regenerate {3} until end of turn.
If Witch Mercy is exiled return it to your deck, shuffle your deck afterwards.