Krosius, the Awoken Wilds

Trample, Deathwish (Creatures you control deal commander damage as long as this card is in your command zone.)
{t}, Pay 1 life, target creature gets +1/+1 and trample until end of turn.
{ut}, Add {g}{g}{g} to your mana pool. Spend this mana only to cast a creature or enchantment spell.