I found a MTG custom card maker and I will be creating cards related to CoS : r/CurseofStrahd
Card Creator on Steam
Online Card Maker - Create a Custom Card With Venngage
PokeCardMaker - Create Your Custom Poke Card now!
Card Conjurer — A Web-Based Custom Magic Card Maker With Expedition, Inventions, Ikoria nickname cards, and so much more... : r/magicTCG
Customized Champion card - Clash of Decks
Free Card Maker: Create Custom Cards Online
How to create my own card game
PokeCardMaker - Create Your Custom Poke Card now!
PokeCardMaker - Create Your Custom Poke Card now!
Custom Card Creator – Fairway 3 Games
Design and print your own pokemon card - Pokémon card maker - Custom black and white cards | Pokemon cards, Pokemon birthday party, Pokemon party decorations