The requirements for this list are simple: The card must influence the majority of the other card selections in the deck, or be otherwise crucial to a win condition
Legends can use as many haymakers as possible, while discard decks like Kefka, Court MageKefka, Court Mage also appreciate building up a critical mass of discard effects, since they stack very well together
Other major players in the digital CCG market have already bowed out, including Valve and its Artifact, leaving MTG Arena and Blizzard's Hearthstone as the only notable titles in this market, at least for now.
The second most popular archetype, mono-green devotion, now includes Polukranos Reborn from March of the Machine but, overall, with the card pool being so large, only a small fraction of the new cards make an impact, thus greatly diminishing the Too Many New Cards effect