Rule 358
5. Check legality.
- 358.1 Check that all chosen targets are legal.
- 358.2 Check that all costs were paid.
- 358.3 Check that the outcome of the effect of this card being played would not create an illegal state. Example: Check that…
- 358.4 Check that the card has the appropriate permissions to be played at this timing. Example: If the state is Showdown…
- 358.5 If any of the above checks fail, the actions taken in this process are undone and the action is cancelled.