Owner

Counter spells that cost X. X can't be 0.
{p/r}{p/u}: Play an instant in your graveyard this turn without paying its cost
{p/b}{p/w}: All opponents lose 2 life. Gain 2 life.
{p/u}{p/w}: Exile target permanent and return it to the battlefield.
{p/r}{p/b}: Destroy a creature each player controls. That player loses life equal to its power.
{p/w}{p/r}: Search your library for an equipment
and equip it to target creature.