- Can I use Shadow Rider Calyrex VMAX's "Underworld Door" Ability if there are no cards left in my deck to draw from?
- Yes, you can. Attaching Psychic Energy is the main effect of the Ability, which means it can be used even if you have 0 cards in your deck.
Source:
Chilling Reign FAQ; TPCi Rules Team (2021-06-17)
Relevant cards
Note: All applicable cards may not be listed below.
SWSH6_75