Card name: Carrier Thrall
Mana Cost: CMC1Color B
Converted Mana Cost: 2
Types: Creature — Vampire
Card Text: When Carrier Thrall dies, create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this creature: Add Mana C to your mana pool."
Flavor Text: "Later we will mourn those we have lost. First we must end their suffering."

—Drana, Kalastria bloodchief

P/T: (2/1)
Expansion: BFZU Battle for Zendikar
Rarity: Uncommon

Carrier Thrall
Card rulings (?)
2015-08-25 Eldrazi Scions are similar to Eldrazi Spawn, seen in the Zendikar block. Note that Eldrazi Scions are 1/1, not 0/1.
2015-08-25 Eldrazi and Scion are each separate creature types. Anything that affects Eldrazi will affect these tokens, for example.
2015-08-25 Sacrificing an Eldrazi Scion creature token to add {C} to your mana pool is a mana ability. It doesn't use the stack and can't be responded to.
2015-08-25 Some instants and sorceries that create Eldrazi Scions require targets. If all targets for such a spell have become illegal by the time that spell tries to resolve, the spell will be countered and none of its effects will happen. You won't get any Eldrazi Scions.