Polybius

[A NEW GAME] You and target opposing Caster each reveal a Page from the top of your respective Spellbooks one at a time simultaneously until either Caster reveals a Page this way with a lower printed Aura Cost than the other Page (both Pages must have an Aura Cost). The Caster with the lower printed Aura Cost or who has no Pages left in their Spellbook to reveal, deals 20 Damage to a Beastie or Artifact they control for each Page they revealed. Shuffle all revealed Pages back into their Spellbooks.