Agnate, Metathran Commander

Multikicker {1}{w}{b} (You may pay an additional {1}{w}{b} any number of times as you cast this spell.)
When Agnate, Metathran Commander enters the
battlefield, each opponent loses 1 life and
sacrifices a creature for each time it was kicked.
You gain life equal to life lost this way.
Whenever you kick a spell, draw a card for each
time that spell was kicked.