The Organ Pioneer

Flying, crew 5
Whenever The Organ Pioneer attacks, you
may sacrifice a creature crewing The Organ
Pioneer. If you do, reveal the top card of your
library. If it's a creature card, until your next
turn, whenever you sacrifice a creature using
one of The Organ Pioneer's abilities, The
Organ Pioneer deals damage to target creature
an opponent controls equal to the revealed
creature card's power.