Professor's Research (209/202) [Sword & Shield: Base Set] Darkness You can only use this

You can only use this effect of "Iron Knight" once per turn

Set: Tournament Pack 8 Card type: Normal Monster Rarity: Common Attack: 700 Defense: 500 This wizard worships the darkness

Set: Ancient Sanctuary Card type: Effect Monster Rarity: Common Attack: 1550 Defense: 1550 Each time this card inflicts Battle Damage to your opponent''s Life Points

Set: Astral Pack 4 Card type: Normal Spell Rarity: Super Rare Target 1 of your banished "Spellbook" Spell Cards except "Spellbook of Eternity"

during damage calculation (in either player's turn): You can activate this effect once per battle

Professor's Research (209/202) [Sword & Shield: Base Set] Darkness You can only use thisSet: Sword & Shield: Base Set Type: Supporter Rarity: Secret Rare