Koa'ki Meiru Sandman [BP03-EN072] Rare

Koa'ki Meiru Sandman [BP03-EN072] RareSet: Battle Pack 3: Monster League Card type: Effect Monster Rarity: Rare Attack: 1900 Defense: 1200 During each of your End Phases, destroy this card unless you send 1 "Iron Core of Koa'ki Meiru" from your hand to the Graveyard or reveal 1 Rock Type monster in your hand. During either player's turn, when your opponent activates a trap card: You can Tribute this card to negate the activation, and if you do destroy this card.

and can not be Special Summoned by other ways

Set: Black & White: Plasma Blast Type: Dragon Rarity: Uncommon Retreat cost: Colorless

Set: Time Spiral Remastered Type: Creature — Bird Wizard Rarity: Common Cost: {3}{U} Flash

Set: Theros Type: Creature — Human Cleric Rarity: Common Cost: {2}{B}{B} When Disciple of Phenax enters the battlefield

yours truly already has

Set: Legendary Collection 2 Card type: Effect Monster Rarity: Rare Attack: 1600 Defense: 1800 Once

but no one has ever tried to collect

"All the dead sleep lightly here

except "Matriarch of Nephthys"

Keep your distance

Set: Force of the Breaker Card type: Quick Play Spell Rarity: Common Attack: 0 Defense: 0 Pay 500 Life Points

Set: Shadows over Innistrad Type: Sorcery Rarity: Uncommon Cost: {1}{W} Put target card from a graveyard on the top or bottom of its owner's library