Tomb of the Mad Prophet

This card costs {2} more to cast for each
opponent you have.
Spells that target this card cost {2} more to cast
for each opponent you have.
You may look at the top card of any opponent's library at any time.
Whenever an opponent attacks you or a planeswalker you control, destroy all creatures
that opponent controls that has a remaining toughness of 3 or less after the combat damage
step.