Collective Restraint - 49 - (Invasion)
Creatures can’t attack you unless their controller pays X for each creature attacking you, where X is the number of basic land types among lands you control. (This cost is paid as attackers are declared.)

Description
Creatures can’t attack you unless their controller pays X for each creature attacking you, where X is the number of basic land types among lands you control. (This cost is paid as attackers are declared.)











