This ramp deck leans on cheap mana (Eldrazi Spawn tokens, Ancient Stirrings hits) to power out Devourer of Destiny and Emrakul, the Promised End. Thoughtseize taken early strips a key piece like Malevolent Rumble or a big Eldrazi threat before it can take over the game. Meltdown for X=0 or X=1 cleans up Urza's Saga's Construct tokens and other cheap artifacts that enable their mana. Feed the Swarm can pick off Basking Broodscale or Devourer of Destiny once it resolves, though removing Devourer of Destiny costs 7 life. Mutagenic Growth and Violent Urge are combat-focused cards that matter less against a deck trying to go over the top of you, so they make room.