This combo has the potential to get you a ton of Rat Colony copies on the battlefield with just the cast of one
If you run the original Saheeli and a blink package, you can always go with Felidar Guardian if youre into combos, which is helped by the precon coming with Panharmonicon
Moonsilver Key also grabs the excellent Cursed Mirror and one of the best green cards in the format, The Great Henge
The best there is
If more than three other creatures you control enter simultaneously, that choice is made only for the first three
With the Secrets of Strixhaven decks being much newer (and not yet released at the time of writing), we're taking into account their reprint value, deck lists, mechanics, any clear synergies we can see on paper, upgradability, and whether we think the decks will be fun to play with