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Its effect of slipping into your opponents deck is also perfectly fitting for the theme

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However, unlike spell cards, which are most often activated on a player's turn, trap cards have to be set in the Spell/Trap Zone and then activated on a later turn, typically your opponents turn

R Rare Exosister Elis X LIGHT Level 4 [ SpellcasterEffect ] ATK 500 DEF 800 If you control an "Exosister" monster: You can Special Summon this card from your hand, then if you control "Exosister Stella", you gain 800 LP

1 Trainer First Tournament To me, thats the most historically significant Pokmon card

Things that affect basic land types do.