The whole thing was unfortunately a bit of a debacle, as visual indicators on the cards dont make it easily understood which cards are legal and which are not
Maybe to a fault, Masterpieces were too commercially successful

The Astonishing Ant-Man 24%inclusion 751 decks 3.17K decks Crystal, Inhuman Princess 10%inclusion 284 decks 2.79K decks The Fantastic Four 14%inclusion 172 decks 1.24K decks Bruce Banner 3.0%inclusion 152 decks 5.02K decks Thanos, the Mad Titan 1.5%inclusion 33 decks 2.23K decks Top Commanders Leonardo, the Balance // Michelangelo, the Heart 57%inclusion 4.76K decks 8.29K decks Quandrix, the Proof 40%inclusion 1.94K decks 4.88K decks Heroes in a Half Shell 58%inclusion 1.88K decks 3.23K decks April O'Neil, Live on the Scene // Leonardo, the Balance 62%inclusion 796 decks 1.28K decks Leonardo, the Balance // Raphael, the Muscle 47%inclusion 676 decks 1.43K decks The Wandering Minstrel 8.4%inclusion 589 decks 7K decks Leonardo, the Balance 61%inclusion 494 decks 816 decks Donatello, the Brains // Michelangelo, the Heart 43%inclusion 355 decks 819 decks Mikey & Don, Party Planners 61%inclusion 346 decks 569 decks Donatello, the Brains // Leonardo, the Balance 37%inclusion 329 decks 884 decks Codie, Vociferous Codex 8.1%inclusion 263 decks 3.25K decks Omo, Queen of Vesuva 6.6%inclusion 260 decks 3.96K decks Omnath, Locus of Creation 3.8%inclusion 208 decks 5.42K decks Aesi, Tyrant of Gyre Strait 3.7%inclusion 206 decks 5.50K decks Niv-Mizzet, Supreme 22%inclusion 199 decks 903 decks Glarb, Calamity's Augur 2.3%inclusion 173 decks 7.51K decks Niv-Mizzet Reborn 11%inclusion 168 decks 1.56K decks Aragorn, the Uniter 2.3%inclusion 163 decks 7.15K decks Tatyova, Benthic Druid 5.7%inclusion 160 decks 2.83K decks Nine-Fingers Keene 8.3%inclusion 147 decks 1.76K decks Aloy, Savior of Meridian 3.1%inclusion 137 decks 4.43K decks Maralen, Fae Ascendant 1.1%inclusion 136 decks 12.3K decks Zimone, Mystery Unraveler 3.3%inclusion 134 decks 4.05K decks Genghis Frog 46%inclusion 129 decks 280 decks New Cards Mister Fantastic, Reed Richards 7.4%inclusion 0.5lift 672 decks 9.13K decks Ant-Man, Colony Commander 5.4%inclusion 0.8lift 495 decks 9.13K decks Pym Particles 5.3%inclusion 0.7lift 469 decks 8.90K decks Iron Man, Armored Avenger 4.1%inclusion 0.6lift 378 decks 9.13K decks Cosmic Crucible 4.0%inclusion 0.5lift 332 decks 8.30K decks High Lift Cards Roadkill Rodney 14%inclusion 1.4lift 3.27K decks 23.6K decks Mole Module 5.8%inclusion 1.4lift 1.38K decks 23.6K decks Super Combo 28%inclusion 1.4lift 6.69K decks 23.6K decks Foot Chopper 21%inclusion 1.4lift 2.74K decks 12.9K decks Swift Demise 42%inclusion 1.4lift 5.48K decks 12.9K decks April O'Neil, Live on the Scene 25%inclusion 1.4lift 5.83K decks 23.6K decks Rat King, Pale Piper 13%inclusion 1.4lift 1.70K decks 12.9K decks Dimension X Pizzasaur 33%inclusion 1.4lift 4.21K decks 12.9K decks Rocksteady, Mutant Marauder 26%inclusion 1.4lift 6.06K decks 23.6K decks Game Over 40%inclusion 1.3lift 5.16K decks 12.9K decks Top Cards Assassin's Trophy 69%inclusion 0.5lift 8.92K decks 12.9K decks Cultivate 64%inclusion 0.2lift 15.1K decks 23.6K decks Continue

As with many trading card games, the value of the card can fluctuate massively, just look at how much original Pokemon cards are worth
That was probably something I needed to do regardless ( Magic only had three rarities when I first made Mood Swings ), but this was when I did it