Riddlemaster Sphinx [Core Set 2019]Set: Core Set 2019 Type: Creature Sphinx Rarity: Rare Cost: {4}{U}{U} Flying (This creature can't be blocked except by creatures with flying or reach.) When Riddlemaster Sphinx enters the battlefield, you may return target creature an opponent controls to its owner's hand. "Safe passage requires only a simple answer to a simple question, traveler."

Set: Wizards of the Coast: Black Star Promos Type: Water Rarity: Black Star Promo Retreat cost: Colorless

where X is Resilient Khenra's power

Set: World Championships 2006 Type: Psychic Rarity: Common

Set: World Championships 2018 Type: Psychic Rarity: Ultra Rare Retreat cost: Colorless

Set: Team Rocket Unlimited Type: Psychic Rarity: Uncommon Retreat cost: Colorless

Set: Black & White: Plasma Blast Type: Item Rarity: Secret Rare

Set: Black & White: Legendary Treasures Type: Water Rarity: Holo Rare Retreat cost: Colorless

Set: Platinum: Base Set Type: Psychic Rarity: Ultra Rare Retreat cost: Colorless

Set: Guildpact Type: Creature — Nephilim Rarity: Rare Cost: {W}{U}{B}{R} Whenever Yore-Tiller Nephilim attacks

Set: HeartGold & SoulSilver: Unleashed Type: Lightning Rarity: Ultra Rare Retreat cost: Colorless

Set: Sun & Moon: Celestial Storm Type: Water Rarity: Common Retreat cost: Colorless

Set: Gym Challenge Unlimited Type: Fire Rarity: Holo Rare Retreat cost: Colorless