Doomed Homunculus

If an effect would cause Doomed Homunculus to
be sacrificed, instead destroy it.
{b}{r}: Regenerate Doomed Homunculus. If this creature's destruction is prevented this way, put a
death counter on it.
{1}{u}{g}: Doomed Homunculus gets +1/+1 for
each death counter on it until the end of turn.
The Rakdos wanted something they could keep killing
over and over again. The Simic obliged them.