Commander's Herald can confirm that this is a byproduct of an issue Wizards of the Coast created by printing certain cards in the Spider-Man Set: they sacrificed half of their Prerelease audience
My guess is the subtypes are “Infinity Stone” (one subtype) and “Terminus Stone” (another single subtype), where either name refers to the same thing.
Multi-word subtypes have been a thing for a short while though ever since “Time Lord” (and maybe earlier, but all I can think of is “Assembly-Worker”).
@TehPers@mike In many ways it doesn’t actually matter, as it isn’t implemented in English. There isn’t a comprehensive rules for mtgo, just what the game does.
205.3g Artifacts have their own unique set of subtypes; these subtypes are called artifact types. The artifact types are Attraction (see rule 717), Blood, Bobblehead, Clue, Contraption, Equipment (see rule 301.5), Food, Fortification (see rule 301.6), Gold, Incubator, Infinity, Junk, Lander, Map, Powerstone, Spacecraft, Stone, Treasure, and Vehicle (see rule 301.7).
Looks like Terminus does not show up, and “Infinity” and “Stone” are separate subtypes oddly. I guess their digital clients are just doing whatever they want.
My guess is the subtypes are “Infinity Stone” (one subtype) and “Terminus Stone” (another single subtype), where either name refers to the same thing.
Multi-word subtypes have been a thing for a short while though ever since “Time Lord” (and maybe earlier, but all I can think of is “Assembly-Worker”).
Edit: they are separate subtypes. See below.
@TehPers @mike In many ways it doesn’t actually matter, as it isn’t implemented in English. There isn’t a comprehensive rules for mtgo, just what the game does.
I got curious, so I checked the CR:
Looks like Terminus does not show up, and “Infinity” and “Stone” are separate subtypes oddly. I guess their digital clients are just doing whatever they want.
This is super helpful, thanks @TehPers@beehaw.org