User of the 15th Circle

Whenever you cast an instant or sorcery spell,
create a 1/1 green Squirrel creature token.
Other Squirrels you control have prowess.
At the beginning of your upkeep, exile target
instant or sorcery card from your graveyard with
mana value less than or equal to the number of Squirrels you control. You may cast it without
paying its mana cost until end of turn.