Deathreap Ritual

Morbid — At the beginning of each end step,
if a creature died this turn, you may draw
a card.

The Losers decide to make Pennywise feel smaller by insulting It. The friends cause It to physically grow smaller and weaker, regressing into a small, harmless
clown-like creature. Mike tears out It's heart and as
It weakly laughs that his enemies are no longer kids, finally dies when they crush his heart together, ultimately avenging all of It's victims.