Q1: When I would play a Digimon card with the ADVENTURE trait from my hand, if I activate the Your Turn effects on both this card and [[ST21-12|ST21-12 Joe Kido & Mimi Tachikawa]], is the play cost reduced by a total of 2?
Yes, the play cost will be reduced by a total of 2.
Matt Ishida & T.K. Takaishi ST21-13 R ADVENTURE [Your Turn] When any Digimon cards with the [ADVENTURE] trait would be played from your hand, by suspending this Tamer, reduce the play cost by 1. [Your Turn] All of your level 5 or higher Digimon with the [ADVENTURE] trait gain <Rush>. (This Digimon can attack the turn it was played.) --- [Security] Play this card without paying the cost.
Matt Ishida & T.K. Takaishi ST21-13 R ADVENTURE [Your Turn] When any Digimon cards with the [ADVENTURE] trait would be played from your hand, by suspending this Tamer, reduce the play cost by 1. [Your Turn] All of your level 5 or higher Digimon with the [ADVENTURE] trait gain <Rush>. (This Digimon can attack the turn it was played.) --- [Security] Play this card without paying the cost.
Matt Ishida & T.K. Takaishi ST21-13 R ADVENTURE [Your Turn] When any Digimon cards with the [ADVENTURE] trait would be played from your hand, by suspending this Tamer, reduce the play cost by 1. [Your Turn] All of your level 5 or higher Digimon with the [ADVENTURE] trait gain <Rush>. ---