The "Invading Spawn" deck lets you harvest the spawn of the monstrous Eldrazi that have begun to rampage across Zendikar's landscape. Many of your creatures create Eldrazi Spawn creature tokens, including Pawn of Ulamog, Emrakul's Hatcher, and Rapacious One. Your spells also get into the act. Corpsehatch and Essence Feed provide Eldrazi Spawn in addition to removing a creature or draining life from your opponent.
Each Eldrazi Spawn can be sacrificed to add to your mana pool, but your deck features many other ways to use your burgeoning brood. The Eldrazi Spawn are expendable, so don't hesitate to sacrifice them—to Bloodthrone Vampire for a temporary boost, or to Magmaw for damage! Hand of Emrakul will happily appear if you sacrifice four Eldrazi Spawn. Lavafume Invoker will transform the Eldrazi Spawn into a mighty attacking army. If nothing else, you can sacrifice your Eldrazi Spawn for mana to fuel a huge Fireball or to pump up Drana, Kalastria Bloodchief.
Many other Rise of the Eldrazi cards can help the "Invading Spawn" deck. Raid Bombardment deals 1 damage to your opponent every time a creature you control with power 2 or less attacks, even creatures with 0 power like the Eldrazi Spawn. Skittering Invasion creates five Eldrazi Spawn—perfect for when your Magmaw or Hand of Emrakul is feeling ravenous. If you can, harness the power of the planeswalker Sarkhan the Mad. Once each turn, he can essentially change any creature on the battlefield into a 5/5 red flying Dragon!