<b>SWARMING INSTINCT</b>
The Eldrazi are lose on Zendikar in their twisted multitudes, and these monstrosities seek only to feed. Use your swarm of Eldrazi Scion tokens to overwhelm the enemy, or sacrifice them to call on even greater Eldrazi.

Titanic Eldrazi creatures are at your beck and call in the "Swarming Instinct" deck. Summon a horde of Eldrazi Scions to keep your opponent at bay before sacrificing your swarm to cast enormous Eldrazi monstrosities.

Start the game by filling the battlefield with Eldrazi Scions, using cards like Eldrazi Skyspawner and Call the Scions. The new and improved 1/1 Eldrazi Scions are still colorless creature tokens, so you'll need to represent them with something - such as the token cards found in Battle for Zendikar booster packs. Try to block opposing attacks with your non-Scion creatures first, preserving your Scion's mana for later.

Your Eldrazi Scions and the creatures that make them should defend you from smaller creatures, so save Titan's Presence and Scour from Existence for your opponent's largest creatures. Don't spend Scions casting two cheap spells in  one turn, as you'll be unable to cast your most expensive spells later on. Once you've cast Drowner of Hope, Bane of Bala Ged, Breaker of Armies, or Desolation Twin, you can begin crushing your opponent in combat.

The Battle for Zendikar set includes many cards you could add to the "Swarming Instinct" deck. Ruination Guide grants your other colorless creatures +1/+0, making your Eldrazi Scions more dangerous. From Beyond proveds steady Scion production and can be sacrificed to search for a finisher. The best finisher of all? That would be Ulamog, the Ceaseless Hunger, an indestructible Eldrazi titan capable of exiling your opponent's entire library in a few swings.