The Edge Trials

(You may cast a legendary sorcery only if you control
a legendary creature or planeswalker.)
Each player picks one creature they control. Exile
those creatures. At the beginning of the next end
step, randomly select a creature from the creatures exiled in this way. Return it to the battlefield
under your control, and put five +1/+1 counters
on it.
Storm. (When you cast this spell, copy it for each spell
cast before it this turn.)