Bearer of Silence

Text:

Devoid (This card has no color.)
When you cast this spell, you may pay {C}. If you do, target opponent sacrifices a creature. ({C} represents colorless mana.)
Flying
Bearer of Silence can't block.

Rulings:

• 1/22/2016 Bearer of Silence’s triggered ability targets only the player, not any creature. For example, the player may sacrifice a creature with hexproof.
• 1/22/2016 Players can respond to the triggered ability, but once it starts resolving and you decide whether to pay <img src="/Handlers/Image.ashx?size=small&amp;name=1&amp;type=symbol" alt="1" align="absbottom" /><img src="/Handlers/Image.ashx?size=small&amp;name=C&amp;type=symbol" alt="Colorless" align="absbottom" />, it’s too late for anyone to respond.