We create both the cards and the mechanics by asking ourselves what it is like to be a human that returns to the world as a spirit, or as a werewolf that desires nightfall. The return of flashback very much fits into this design approach
but, I never knew about two variations until recently
Many of the best staple spell cards in Yu-Gi-Oh Master Duel are quick-play spell cards that can be activated in either players turn (the card must be set on the field in order to activate during your opponents turn) to counter their monster effects, spells and trap cards
Individual cards, even those that seem like sure bets, carry inherent volatility that sealed products essentially do not
Its a fun project that combines modeling, shading, texturing, and animation, so theres something for everyone, whether youre just starting out or already have some experience with Blender
Kozilek has become a bit harder to get