Deepwood Chieftain

When Deepwood Chieftain enters the battlefield you may sacrifice another creature you control, if you do put a +1/+1 counter on Deepwood Chieftain equal to sacrificed creatures toughness, and Deepwood Chieftain gains Trample and Menace.
To be a tribal leader in the Deepwood you need a Carnosaur ally, to keep your ally you need to make sure it is well fed.