Mathematician [SDCL-EN017] Common Legendary Dragon Decks You can only use this

You can only use this effect of "Shiranui Spectralsword" once per turn

Set: 2018 Mega-Tins Mega Pack Card type: Effect Monster Rarity: Rare Attack: 0 Defense: 0 Cannot be Normal Summoned/Set

also it gains another 1200 ATK

Set: 2018 Mega-Tins Mega Pack Card type: Continuous Spell Rarity: Rare When this card is activated: You can target 1 of your banished "Mekk-Knight" monsters or "World Legacy" cards

Mathematician [SDCL-EN017] Common Legendary Dragon Decks You can only use thisSet: Structure Deck: Cyberse Link Card type: Effect Monster Rarity: Common Attack: 1500 Defense: 500 When this card is Normal Summoned: You can send 1 Level 4 or lower monster from your Deck to the GY. When this card is destroyed by battle and sent to the GY: You can draw 1 card.