Troupe Master Grimm

When Grimm enters create Grimmchild a legendary 1/2 red Nightmare Insect creature token with flying and “This creature gets +1/+1 for each Grimmflame counter on it”

At the beginning of each endstep if a creature died this turn you may put a Grimmflame counter on another target creature you control.

Sacrifice another creature you control with five or more Grimmflame counters on it: exile Grimm and return it to the battlefield transformed. Activate this ability only as a sorcery.