Modern players can use this card in so many ways, but the most interesting one is combining it with Cryptic Command.
Here's the possible sequence:
- Play Mystic Sanctuary
- Play Cryptic Command with one of the abilities to return a permanent to their controller's hand
- Return Mystic Sanctuary to your hand
- Play Mystic Sanctuary again
- Put Cryptic Command on top of your library
- Rinse and repeat
This simple combo will let you loop the combo and have infinite Cryptic Commands. Not many decks will be able to play against it.
Published Sep. 26th 2019