Whir of Invention [Aether Revolt Promos] Elf Archer sacrifice Koskun Falls unless you

sacrifice Koskun Falls unless you tap an untapped creature you control

pay {2}{G}{G}

Set: Judge Gift Cards 2014 Type: Basic Land — Plains Rarity: Rare ({T}: Add {W}

or enchanted by anything black

Set: Masters 25 Type: Legendary Creature — Human Monk Rarity: Rare Cost: {2}{G} You may play two additional lands on each of your turns

Whir of Invention [Aether Revolt Promos] Elf Archer sacrifice Koskun Falls unless youSet: Aether Revolt Promos Type: Instant Rarity: Rare Cost: {X}{U}{U}{U} Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.) Search your library for an artifact card with mana value X or less, put it onto the battlefield, then shuffle.