Slifer the Sky Dragon [JUMP-EN061] Ultra Rare Fairy You can only activate 1

You can only activate 1 "Celestial Observatory" per turn

destroy face-up monsters on the field

You can target 1 face-up monster you control

" monster whose Level is at least 5 higher than its original Level battles an opponent's monster and inflicts battle damage to them: You can banish 1 card from your hand

Set: Speed Duel Decks: Duelists of Tomorrow Card type: Effect Monster Rarity: Common Attack: 0 Defense: 0 When this card is Summoned: Target 1 face-up monster your opponent controls

Slifer the Sky Dragon [JUMP-EN061] Ultra Rare Fairy You can only activate 1Set: Shonen Jump Magazine Promos Card type: Effect Monster Rarity: Ultra Rare Attack: ? Defense: ? Requires 3 Tributes to Normal Summon (cannot be Normal Set). This card's Normal Summon cannot be negated. When Normal Summoned, cards and effects cannot be activated. During the End Phase, if this card was Special Summoned: Send it to the Graveyard. This card gains 1000 ATK and DEF for each card in your hand. When a monster(s) is Normal or Special