Spiked Pit Trap

Spiked Pit Trap comes into play face down
and can be turned up at any time for its
Activate cost.
Activate: {x}{x}
When Spiked Pit Trap is turned face up, the
player who is attacking you sacrifices up to X
attacking creatures without flying chosen at
random.
{4}: Return Spiked Pit Trap to its owner's
hand.