Tyr, God of War

Double strike, hexproof
If Tyr, God of War hasn't been exerted this
turn, you may exert it as it attacks. When you do,
untap all other creatures you control and after
this phase, there is an additional combat phase.
You must know victory-runes if you want to know
victory. Carve them into your sword's hilt, on the
blade guards and the blades, invoking Tyr's name
twice.