The Agent of Mystery - Earth [SDLS-EN002] Super Rare Crossed Souls place it on either the

place it on either the top or bottom of their Deck

Set: OTS Tournament Pack 2 Card type: Effect Monster Rarity: Ultimate Rare Attack: 2400 Defense: 1000 When this card is Normal or Special Summoned: You can target up to 2 cards on the field

and cannot be equipped by other ways

but you can add some extra firepower to your Deck with the help of other products like Duel Overload and more

DARK: Banish 1 random card from you opponent's hand face-down

The Agent of Mystery - Earth [SDLS-EN002] Super Rare Crossed Souls place it on either theSet: Structure Deck: Lost Sanctuary Card type: Tuner Monster Rarity: Super Rare Attack: 1000 Defense: 800 When this card is Normal Summoned, you can add 1 "The Agent" monster from your Deck to your hand, except "The Agent of Mystery Earth". While "The Sanctuary in the Sky" is face up on the field, you can add 1 "Master Hyperion" from your Deck to your hand instead.