When Bill the Pony enters, create two Food tokens. (They're artifacts with "{2}, {T}, Sacrifice this token: You gain 3 life.") Sacrifice a Food: Until end of turn, target creature you control assigns combat damage equal to its toughness rather than its power.

Other Horses you control have indestructible. At the beginning of each end step, if you gained life this turn, create a 5/5 white Horse creature token.

As this creature enters, choose a color. Whenever you cast a spell of the chosen color, you gain 1 life.

Whenever a commander you control attacks, put a +1/+1 counter on it. Partner (You can have two commanders if both have partner.)