Zero, the Flashing Mage-Warrior (RL1607-1) [Promo Cards]

[Quickcast] (You may play this card anytime you can play a [Spell:Chant-Instant].) [ENTER] Put a knowledge counter on this card. Whenever another Six Sages enters your field, put a knowledge counter on this card. Remove a knowledge counter from this card : Prevent the next 300 damage that would be dealt to target resonator this turn.