Damping Engine

Artifact, 4 (4)
A player who controls more permanents than any other can't play lands or cast artifact, creature, or enchantment spells. That player may sacrifice a permanent to ignore this effect until end of turn.¹
Illus. rk post

Gatherer Card Rulings [Nov 2009]

• 8/1/2008: A player affected by this card can sacrifice a permanent any time he or she could cast an instant. This is a special action that doesn't use the stack and can't be responded to.
• 8/1/2008: A player can only sacrifice a permanent to end this effect if he or she has more permanents than any other player, and he or she hasn't already sacrificed a permanent to end the effect this turn. The ability to sacrifice a creature is granted by the same effect that is being ended.

Format Legality	Legal in Vintage, Legacy Banned in Extended, Standard
Printings (1/6)	Urza's Legacy (Rare)