With how old the mechanic is, there have been a ton of cards released with the ability
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BT6-112 SEC Digimon Lv.6 Alternative Art BeelStarmon Color Purple Cost 12 DP 11000 Digivolve Cost 1 Purple 3 from Lv.5 Form Mega Attribute Virus Type Wizard/Three Musketeers Card Text 1 [Effect] When playing this card from your hand, reduce its play cost by 1 for each [Three Musketeers] Digimon card and Option card with a memory cost of 7 in your trash
There are typically two types of cards that get banned: cards that do fundamentally broken things (Hypergenesis, Rite of Flame, Summer Bloom), and cards that are so universally powerful that they become ubiquitous (Deathrite Shaman, Stoneforge Mystic, Mental Misstep)
It has a nice card database and auto-fill for when youre typing in a card name, but thats as far as it goes when it comes to features