Shavka's Lute

Warcry - Each time a unit or Relic Weapon with Warcry attacks, it grants a permanent bonus to the top-most unit or weapon in your deck. Even if it's a few cards down, you'll get to stack up the bonuses on it over multiple turns.

Spellcraft - When you play a weapon with Spellcraft, you may spend power to create and play the listed spell.