Bearer of Silence
Creature — Eldrazi
Devoid (This card has no color.)
When you cast this spell, you may pay 
. If you do, target opponent sacrifices a creature. ( represents colorless mana.)
Flying
Bearer of Silence can't block.
2/1
Illustrated by
Oath of the Gatewatch Promos#67sRareEnglishLegality
Rulings
Jan 22, 2016
Bearer of Silence’s triggered ability targets only the player, not any creature. For example, the player may sacrifice a creature with hexproof.
Jan 22, 2016
Players can respond to the triggered ability, but once it starts resolving and you decide whether to pay , it’s too late for anyone to respond.