Nanashi Mumei, Civ. Warden

Nonbasic landwalk, deathtouch, first strike, Ward {x} where X is the number of Council creatures you control. Mumei must attack each turn if able.

Guardian of Civilization - As this creature enters, choose a creature type.
Other creatures you control of the chosen type get +2/+2.

When you cast Mumei each opponent sacrifices a creature. Mumei enters with X +1/+1 counters, where X is the total power of creatures sacrificed this way.