Project 13

Flash, Hexproof
When Project 13 enters the battlefield, you may sacrifice X number of creatures under your control. Put +1/+1 counter on Project 13 equal to combined power of all these creatures, then draw X cards. Project 13 gains keywords of every creature sacrificed this way.
{g/u}{g/u}{g/u}: Exile target creature from a graveyard. When you do, put +1/+1 counter on it and draw a card. Activate this ability only as a sorcery.