Tom Foolery, Demon Jester

This spell costs {1} less to cast for each creature in
your party.
Whenever a source you control causes a card to
be exiled, you may pay {4}{u/b}{u/b}. If you do, put a
pact counter on it as it is exiled. This ability costs {1} less to activate for each creature in your party.
You may cast cards with a pact counter on them
from exile, spending mana as though it were
mana of any color to cast them.