Doom Stone Imp

{b}{t} - Sacrifice Doom Stone Imp, draw a card.
{r}{t} - Sacrifice Doom Stone Imp, deal 2 damage
to target Creature.
{w}{t} - Sacrifice Doom Stone Imp, create a Doom Creature Token.
{g}{t} - Sacrifice Doom Stone Imp, put a +1/+1 counter on target Demon Creature.