Eldraz, Herald of Apocalypse

Deathtouch, Annihilator 1, Protection from deathtouch, toxic 3.
Eldrazi cost {x} less, {x} is equil to the amount of legendary eldrazi you control. Eldrazi you control have “Sacrifice this creature: add {c} to your mana pool equil to the rarity level (Common 1, Uncommon 2, ex.)”
When this melds with a card, Put that card in the side board
Sacrifice 5 Eldrazi Spawn: Meld With Emrakul, the Aeons Torn, Ulamog, the Ceaseless Hunger, a creature thats name Starts with Kozilek and It that Betrays.