Duolingo, Devourer of Souls

Flying
Whenever Duolingo deals combat damage to a
player, that player puts that many cards from
the top of their library into their graveyard. For
each creature card put into a graveyard in this
way, put a +1/+1 counter on Duolingo, for each
land card put into a graveyard this way, you
gain 1 life, and for each noncreature, nonland
card put into a graveyard this way, each
opponent loses 1 life.