Death's Whisper

Whenever a creature dies put a +1/+1 counter on
Death's Whisper.
{t}, Scry 1, then reveal the top card of your
library. You may destroy a creature with a lesser
mana value than that card.
{6}, Regenerate Death's Whisper. This costs 1 less
to cast for every +1/+1 counter on Death's
Whisper.
"I thought you said it was just a deer, not an evil
spirit sent to kill us all."