Horrendous Slagwurm

Whenever Horrendous Slagwurm enters the battlefield or attacks, it deals 1 damage to each
other creature.
{r}, Discard a card: Horrendous Slagwurm gains
haste until end of turn.
{2}{b}, Sacrifice a creature: Put a +1/+1 counter
on Horrendous Slagwurm. It gains indestructible
until end of turn.