Carrier Thrall
Creature — Vampire
When this creature dies, create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this token: Add 
."
"Later we will mourn those we have lost. First we must end their suffering." —Drana, Kalastria bloodchief
Lius Lasahido
Commander Masters (CMM)
• #142Rulings
Sacrificing an Eldrazi Scion creature token to add {C} is a mana ability. It doesn't use the stack and can't be responded to.
(wotc • 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 won't resolve and none of its effects will happen. You won't get any Eldrazi Scions.
(wotc • 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.
(wotc • 2015-08-25)
Eldrazi and Scion are each separate creature types. Anything that affects Eldrazi will affect these tokens, for example.
(wotc • 2015-08-25)
Printings
Rulings
Sacrificing an Eldrazi Scion creature token to add {C} is a mana ability. It doesn't use the stack and can't be responded to.
(wotc • 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 won't resolve and none of its effects will happen. You won't get any Eldrazi Scions.
(wotc • 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.
(wotc • 2015-08-25)
Eldrazi and Scion are each separate creature types. Anything that affects Eldrazi will affect these tokens, for example.
(wotc • 2015-08-25)