Kragnar the Runescarred

Trample
Ancient Rune Master- Whenever Kragnar attacks or blocks, reveal the top three cards of your library. You may cast one of them without paying its mana cost. Put the rest on the bottom of your library in any order.
Mystic Infusion-{g/u}{g/u}{g/u} Draw two cards. If any are creatures, put a +1/+1 counter on Kragnar.