Adanys, Twilight Rider

When Adanys, Twilight Rider enters the
battlefield or attacks, you may exile a creature
card from your graveyard. If you do, put a
number of +1/+1 counters equal to that
creature's power on Adanys, Twilight Rider.
{1}, discard a card: Adanys, Twilight Rider gains
your choice of flying, deathtouch, or hexproof
until end of turn.