Duvall

{w}{t}: Target creature gains +1/+0 or -1/+0
until the end of the turn.
{t}: Flip a coin. If heads, deal 1 damage to a target
creature. If tails, deal 2 damage to 1 of your
creatures. If Duvall is defeated in this way, its
owner loses.
When Duvall is sent to the graveyard, exile him.
It's a gift for Calcyrx!