Spawnsire of Ulamog [Rise of the Eldrazi] Bird Egg sacrifice Koskun Falls unless you

sacrifice Koskun Falls unless you tap an untapped creature you control

"All we know about the Krosan Forest we have learned from those few who made it out alive

create that many 1/1 black Insect creature tokens

Set: Antiquities Type: Artifact Creature — Shapeshifter Rare Cost: {6} {0}: Urza's Avenger gets -1/-1 and gains your choice of banding

Spawnsire of Ulamog [Rise of the Eldrazi] Bird Egg sacrifice Koskun Falls unless youSet: Rise of the Eldrazi Type: Creature Eldrazi Rare Cost: {10} Annihilator 1 (Whenever this creature attacks, defending player sacrifices a permanent.) {4}: Create two 0 1 colorless Eldrazi Spawn creature tokens. They have "Sacrifice this creature: Add {C}." {20}: Cast any number of Eldrazi cards you own from outside the game without paying their mana costs.