Oriel, Flesh Shaper

0: Whenever one or more +1/+1 counters are put on a creature you control, draw a card.
+1: Switch the base power and toughness of up to 1 target nonartifact creature. Put a +1/+1 counter on up to 1 target creature.
+6: Exile all creature cards in all graveyards. For each card exiled this way, create a 0/0 Thrall with Graft 2.