If 'During battle' is stated in your Digimon's Appearance Requirements, they will be made to appear during the Battle Phase, during the timing where special abilities are activated, with the player second to attack going first
How much ramp and card draw should I include
As for the theme, both the tabletop and Pokmon TCG Pocket release will be themed around Mega Evolutions, with Rayquaza as the face of each
For red, it forces creatures to block it
If the target creature is a token, other creatures you control will copy the original characteristics of that token as stated by the effect that created the token
Ben DeathMoons The idea here is to get a stack of discounted cards, depending on how the game develops