Then maybe equipment to grant the card a countdown of 3 - 50 seconds, make a power effective increase, but cycle if not used in time. Cycle for any deck card, or just for equipped or equipped with countdown. Think deck tunnelling maybe. As you draw it, you then have to prioritise playing or cycle decisions quite quickly. Makes for a good Chaostouched motif.
The player enter the void ability would be great if you could use it to create a second front. in which all voided cards were shown in play. While you are in the void, you can play as usual on your turn against the enemy cards voided. have a card type that returns yourself and or voided cards to the main board. cards going to the crypt in the void instead enter a void crypt. Maybe even a card that can void your opponent or pull them into the void. If both players are in the void, they can effect…