Mystic Dawncaller

Flash

When Mystic Dawncaller enters the battlefield, you may reveal the top card of your library. If it’s a nonland card, you may put it into your hand. If you do, put a +1/+1 counter on Mystic Dawncaller.
Whenever Mystic Dawncaller attacks, you may pay
{g/u}, If you do, draw a card, then put a +1/+1 counter on Mystic Dawncaller.