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
These cards are region locked
Some example decklists I'm using as a basis: Reid Duke's winning Griselbrand list from a June 2012 SGC Open Josh Weinundy's winning list from an October 2011 SGC Open Christopher Walton's top-8 list from the same even A decklist from the Mental Misstep era Andreas Mller's GP-winning list from 2010, predating New Phyrexia Owen Turtenwald's 10-th place list at GP Atlanta, with discussion Robert Cucunato's 1st-place list from an October 2013 SGC Open
Sin, Spira's Punishment Rarity: Rare TYPE: Legendary Creature SUBTYPE: Leviathan Avatar CMC: 7 Mana cost: USD: $1.21 EUR: 1.09 TIX: 0.02 EDHREC RANK: 9638 (7/7) Flying Whenever Sin enters or attacks, exile a permanent card from your graveyard at random, then create a tapped token that's a copy of that card
Good soldiers follow orders after all