They're legal in draft and sealed decks and are otherwise only legal in formats where they were already allowed , just like Masterpieces
4x OP08-036 Electrical Luna Initial Development I started this deck with leftovers from my LGS's "extra commons and uncommons" box (which we fondly refer to as The Community Chest)
It gives you a pest token that attacks for 1 life, which in turn allows you to reanimate a 1-drop, which is a good incentive for sacrificing small creatures
The metrics for this draconic cosplay variant are incredibly intense, reflecting its status as the premier chase card of the entire XY generation
Years later, it still anchors Brilliant Stars market value and defines what a modern chase card should feel like
Yes Man, Personal Securitron is the new Humble Defector, a card that speaks to my group hug sensibilities