Spellbook of Knowledge [COTD-EN062] Ultra Rare Earth You can only use this

You can only use this effect of "Prank-Kids Dropsies" once per turn

also its ATK is halved until the end of this turn

Any Battle Damage from this battle is treated as 0

You can only Special Summon “Crusadia Arboria” once per turn this way

If this face-up card in its owner's control leaves the field because of an opponent's card effect: You can Special Summon 1 Level 4 or lower Zombie monster from your Deck

Spellbook of Knowledge [COTD-EN062] Ultra Rare Earth You can only use thisSet: Code of the Duelist Card type: Normal Spell Rarity: Ultra Rare Send to the GY either 1 Spellcaster monster you control, or 1 other "Spellbook" card from your hand or face up from your field, except "Spellbook of Knowledge", and if you do, draw 2 cards. You can only activate 1 "Spellbook of Knowledge" per turn.