You can have one active virtual card per Sudo. So, depending on your paid plan, you could have:
SudoGo = 3 active virtual cards at a time (1 per Sudo)
SudoPro = 3 active virtual cards at a time (1 per Sudo)
SudoMax = 9 active virtual cards at a time (1 per Sudo).
If your plan allows, you can create up to 5 new virtual cards in a 24-hour period.
While you can create multiple cards, the cards are re-usable and you do not need to create a new virtual card for every transaction.
A total transaction limit of $350 (before transaction fees) per day for all virtual cards combined on your MySudo account applies.
The maximum amount for a single transaction is $250.