This card is near its peak, so where it goes from here will determine its trajectory in the long term

Rarity by Era: What to Look For Base Set Era (1999-2000) Holos are the chase cards 1st Edition stamps multiply value Shadowless prints are valuable e-Card Era (2002-2003) Crystal types are rare and valuable Reverse holos have unique patterns Often overlooked by collectors EX Era (2003-2007) Gold Stars are the holy grail ex Pokemon were the ultra rares Many undervalued compared to vintage Diamond & Pearl through Black & White (2007-2013) Lv.X and Prime cards Secret rares introduced Full arts debut near the end XY through Sun & Moon (2013-2019) Full Arts become standard Rainbow Rares introduced GX and Tag Team cards Sword & Shield (2020-2023) VMAX and VSTAR mechanics Alternate Arts become chase cards Trainer Gallery subsets Scarlet & Violet (2023-present) Pokemon ex (lowercase) returns Special Art Rares / Illustration Rares Current peak of art quality Quick Summary Circle = Common (usually worthless) Diamond = Uncommon (still low value) Star = Rare (baseline for potential value) Holo patterns = Worth more than non-holo Gold cards, Special Art Rares, Full Arts = Check prices immediately Vintage holos and Gold Stars = Potentially very valuable Rarity gets you in the door, but Pokemon popularity and condition determine the final price

Huge credit to the Theros design team for this, because they were able to turn that into the solution god cards had been waiting for all along
Summon: Esper Maduin's second chapter ability isn't a mana ability
Although it can be tough to get two copies of the same card at once to use, a similar effect has been done in the past with cards such as the popular Custom Catcher
Ishihara GX Promo (2017) Publication Date: 2017 Grading: PSA 10 Market Price: $50,000 (most recent sale, 2020) The Ishihara GX Promo served as a corporate Easter egg and a tribute to the legacy of Tsunekazu Ishihara, the president and face of The Pokmon Company