Hitokiri Battosai

Whenever Hitokiri Battosai attacks, if it's equipped, choose one —
• Hitokiri Battosai deals damage equal to the highest mana value among Equipment attached to it
to any target.
• You may cast an instant or sorcery spell from your hand with mana value less than or equal to the highest mana value among Equipment attached to Hitokiri Battosai without paying its mana cost.