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.
Zenith BT21-087 R LIBERATOR [Start of Your Turn] If you have 2 or less memory, set it to 3. [On Play] Reveal the top 3 cards of your deck. Among them, play 1 [Vemmon] without paying the cost or add 1 card with [Vemmon] in its text to the hand. Trash the rest. --- [Security] Play this card without paying the cost.
Zenith BT21-087 R LIBERATOR [Start of Your Turn] If you have 2 or less memory, set it to 3. [On Play] Reveal the top 3 cards of your deck. Among them, play 1 [Vemmon] without paying the cost or add 1 card with [Vemmon] in its text to the hand. Trash the rest. --- [Security] Play this card without paying the cost.
Zenith BT21-087 R LIBERATOR [Start of Your Turn] If you have 2 or less memory, set it to 3. [On Play] Reveal the top 3 cards of your deck. Among them, play 1 [Vemmon] without paying the cost or add 1 card with [Vemmon] in its text to the hand. Trash the rest. ---