Collective Restraint [Invasion] Urza’s Power-Plant integrated machine is his greatest

integrated machine is his greatest strength and weakness

Set: Avacyn Restored Type: Land Rare Cost: As Cavern of Souls enters the battlefield

Set: Eventide Type: Sorcery Rare Cost: {3}{R/W}{R/W} Untap all creatures that attacked this turn

One razorclaw is three bears too many

Set: DCI Legend Membership Type: Instant Rare Cost: {U}{U} Counter target spell

Collective Restraint [Invasion] Urza’s Power-Plant integrated machine is his greatestSet: Invasion Type: Enchantment Rare Cost: {3}{U} Domain Creatures can't attack you unless their controller pays {X} for each creature they control that's attacking you, where X is the number of basic land types among lands you control.