The Cart

Start the game with this card on the battlefield.
Put 10 charge counters on The Cart. At the
beginning of your upkeep, remove a charge
counter. When there are no charge counters,
you lose the game.
Opponents can't take damage except from
The Cart.
Whenever The Cart attacks, it gets +X/+X until
end of turn, where X is the number of creatures
attacking.
Indestructible, trample, menace