Q1: What does a card with "X in its text" refer to?
It refers to a card that contains the specified text or icon in its name, traits, effects, inherited effects, (Rule), digivolution requirements, DNA digivolution, DigiXros requirements, burst digivolve, App Fusion, or Link. For example, a card with Knightmon in its text would include cards with the name DarkKnightmon and cards with the text Knightmon in their effects.
Lv.4 Arresterdramon BT21-066 U Champion | Vaccine | Dragon/Hero [Digivolve] Lv.3 w/<Save> in text or w/[Hero] trait: Cost 2 [On Play] [When Digivolving] You may play 1 Tamer card with the [Hunter] or [Hero] trait from your hand without paying the cost. [On Deletion] You may place 1 Digimon card with <Save> in its text or the [Hero] trait from your hand or trash under any of your Tamers. Then, <Save>. DigiXros -2: 1 Digimon card w/<Save> in text --- Inherited: [Your Turn] This Digimon gets +2000 DP.
Lv.4 Arresterdramon BT21-066 U Champion | Vaccine | Dragon/Hero [Digivolve] Lv.3 w/<Save> in text or w/[Hero] trait: Cost 2 [On Play] [When Digivolving] You may play 1 Tamer card with the [Hunter] or [Hero] trait from your hand without paying the cost. [On Deletion] You may place 1 Digimon card with <Save> in its text or the [Hero] trait from your hand or trash under any of your Tamers. Then, <Save>. DigiXros -2: 1 Digimon card w/<Save> in text --- Inherited: [Your Turn] This Digimon gets +2000 DP.
Lv.4 Arresterdramon BT21-066 U Champion | Vaccine | Dragon/Hero [Digivolve] Lv.3 w/<Save> in its card text or w/[Hero] trait: Cost 2 [On Play] [When Digivolving] You may play 1 Tamer card with the [Hunter] or [Hero] trait from your hand without paying the cost. [On Deletion] You may place 1 Digimon card with <Save> or the [Hero] trait from your hand or trash under any of your Tamers. Then, <Save>. DigiXros -2: 1 Digimon with <Save> in their card text --- Inherited: [Your Turn] This Digimon gets +2000 DP.