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.3 Gumdramon BT21-063 U Rookie | Vaccine | Mini Dragon/Hero [Digivolve] Lv.2 w/<Save> in text or w/[Hero] trait: Cost 0 [On Play] By trashing 1 card with <Save> in its text or the [Hero] trait from your hand, <Draw 2>. [On Deletion] <Save>. --- Inherited: [Your Turn] This Digimon gets +2000 DP.
Lv.3 Gumdramon BT21-063 U Rookie | Vaccine | Mini Dragon/Hero [Digivolve] Lv.2 w/<Save> in text or w/[Hero] trait: Cost 0 [On Play] By trashing 1 card with <Save> in its text or the [Hero] trait from your hand, <Draw 2>. [On Deletion] <Save>. --- Inherited: [Your Turn] This Digimon gets +2000 DP.
Lv.3 Gumdramon BT21-063 U Rookie | Vaccine | Mini Dragon/Hero [Digivolve] Lv.2 w/<Save> in its card text or w/[Hero] trait: Cost 0 [On Play] By trashing 1 card with <Save> or the [Hero] trait from your hand, <Draw 2>. [On Deletion] <Save>. --- Inherited: [Your Turn] This Digimon gets +2000 DP.