Timanrîs, Moody Assassin

At the beginning of your upkeep, choose one -
• Spring - Add {g}{g} to your mana pool. Until
end of turn, you don't lose this mana as steps and
phases end.
• Summer - Target creature gets infect and
trample until end of turn.
• Autumn - You draw a card and lose 2 life.
{bull} Winter {dash} Sacrifice a creature: Destroy target
tapped creature an opponent controls. You lose
life equal to its toughness.