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(Artifacts, legendaries, and Sagas are historic.) Equipped creature gets +10/+0 and has vigilance.Equip legendary creature Set Number 72 Language Espaol Legal Formats Commander, Legacy, Modern, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Pauper, Pioneer, Standard, Timeless Rulings (7/5/2024) Excalibur's mana value doesn't change no matter what the total mana value of historic permanents you control is

The Strategy The Ur-Dragon is very intuitive

Legendary Artifact Enchantment Recursion (CTRL to add secondary) Removal Convert to Slime Destroy up to one target artifact, up to one target creature, and up to one target enchantment

It only transforms while its triggered ability is resolving after you cast an instant or sorcery spell