The standard month sequence can be used in games where card ranks rarely matter, such as Yomi-type, Kabu-type, and Kingo-type games
Wear / Tear A sideboard staple since its release, Wear / Tear deals with two problematic card types at the cost of one sideboard slot
Top 30 Most Valuable Pokmon Cards at a Glance Pikachu Illustrator (1998 Promo) Blastoise Presentation Card (1998) Shadowless Charizard (1st Edition Base Set) Kangaskhan Family Event Trophy Card (1998) No
Also, you can't sell these cards as they violate the copyright.
In a game where lots of weak Digimon have beneficial effects to give to their Digivolutions, this can be seen as a downside, but they tend to shine in two main areas
It was exhausting work, and I havent even checked the other COTDs to see if they reference combos with erratad cards