Rakdos, Cruel Idol

Flying, Trample
Whenever another creature is dealt damage, put
that many -1/-1 counters on it instead. Whenever
a creature you control dies, if it had one or more
-1/-1 counters on it, it deals damage to target
player equal to its base power.
Whenever Rakdos, Cruel Idol attacks, it deals 1
damage to each other creature.