Kratanos, Boulder-King

Haste, Trample.
Exile the top two cards of your library, until end
of turn Kratanos, Boulder-King gains Double-
Strike and gets +X/+X where X is the highest converted mana cost among the exiled cards.
At the end of your end step shuffle those cards
into your library.
"The ground shook, the pillars trembled. Then as a
shadow appeared in the square the people began to flee
as Kratanos madly hurled boulders on their city."