Path to Understanding

Put a spore counter on target creature you
control, Reveal the top card of your library: If
the revealed card is a creature card, you may
cast it by paying its mana cost reduced by {x},
where X equals the number of creatures you
control with a spore counter on them.
Whenever a creature you control with a spore
counter on it would deal combat damage, remove
a spore counter from it and prevent that damage.