Agatha's Soul Cauldron

You may spend mana as though it were mana of
any color to activate abilities of creatures you
control.
Creatures you control with +1/+1 counters on
them have all activated abilities of all creature
cards exiled with Agatha's Soul Cauldron.
{t}: Exile target card from a graveyard. When
a creature card is exiled this way, put a +1/+1
counter on target creature you control.