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A non-blue example is Urza's Bauble

Its a powerhouse, and it deserves your piloting

Level Pairs Due to the less restrictive nature of Xyz Summoning compared to prior mechanics, it's tough to point at any given Rank and name 1 card that can make an Xyz Summon happen

Altar of Bone Altar's Reap Arbiter of Woe Bayou Groff Betrayer's Bargain Blood Divination Blood for Bones Bone Shards Bone Splinters Burnt Offering Call for Blood Carrion Collateral Damage Corrupted Conviction Culling the Weak Death Bomb Demon of Catastrophes Desperate Plea Diabolic Intent Dusk Mangler Duty Beyond Death Eaten Alive Eldritch Evolution Endemic Plague Fiery Conclusion Final Flare Final Payment Final Strike Final Vengeance Flesh Allergy Fling Goremand Grafted Identity Heartfire Ichor Explosion Infernal Plunge Kazuul's Fury Lash of the Balrog Launch Party Lethal Throwdown Life's Legacy Mask of the Mimic Merciless Resolve Metamorphosis Mind Extraction Minion Missile Momentous Fall Morkrut Behemoth Mutual Destruction My Precious Nasty End Neoform Pyrrhic Blast Reckless Abandon Rescue from the Underworld Rite of Consumption Ritual of the Machine Ruthless Disposal Sacrifice Savage Order Scapegoat Severed Strands Skulltap Soul Exchange Spark Harvest Spontaneous Combustion Start // Finish Tend the Pests Tendrils of Despair Thud