The Feasting Beast

Champion a Card (If this card is revealed as your commander, choose a non-legendary card from your
deck, it gains the supertype "Champion" and is put
into your command zone.)
Discard a land: When a Championed permanent
you control is tapped for mana this turn, it
instead produces {g}{g}{g}{g}.
{g}{g}: Target creature you control gains
trample until end of turn.