Cow Herd

Trample
Cow Herd's power and toughness are each equal
to the number of Cows you control.
Whenever Cow Herd deals combat damage
to a player, that player may sacrifice a land
they control. If they don't, you gain 3 life, and at
the beginning of your precombat main phase, you
add {g} for each 1 damage Cow Herd dealt to a
player this turn.