Population Report Since the sets debut in June of 2003, only 192 Mewtwo EX cards have been submitted to PSA for grading
It definitely has its uses and looks like a good sideboard card, but I dont think it gets any better than that
this sort of card advantage is the perfect way to reward an archetype with a variety of shall we say, Draft-level cards, and the mill synergies gives it legs to hop forward even without a dedicated frog build
While some Pokemon spike in popularity when a single chase card is released before fading back into the pack, Mewtwo has produced genuinely valuable, genuinely sought-after cards in Base Set, the Wizards-era Gym sets, the ex era of the mid-2000s, the EX era of XY, the GX era of Sun and Moon, the V/VSTAR era of Sword and Shield, and now the modern Scarlet and Violet era
The mechanic cares about the spells or copies going onto the stack