Koskun Falls [Homelands] Magic 2011 you may pay {1}

you may pay {1}

but my host would casually push it down before I could make out what it was

Set: Amonkhet Invocations Type: Instant Rarity: Mythic Cost: {3}{U}{U} You may pay 1 life and exile a blue card from your hand rather than pay this spell's mana cost

you may sacrifice an artifact

Koskun Falls [Homelands] Magic 2011 you may pay {1}Set: Homelands Type: World Enchantment Rarity: Rare Cost: {2}{B}{B} At the beginning of your upkeep, sacrifice Koskun Falls unless you tap an untapped creature you control. Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.