mtg cards like polymorph · Scryfall Magic: The Gathering Search Polymorph Cards : r/EDH

Until there's a more recent reprint of Fling in a Standard set, the card itself is legal in pretty much any non-rotating format

Quick Study

In a Two-Headed Giant game, life gained by your teammate won't cause Aerith Gainsborough's second ability to trigger, even though it caused your team's life total to increase

In general, Allies are creatures that benefit or are benefited by other Allies

He has also crafted many renowned spells (most notably Mordenkainen's faithful hound)

Commodore Guff, Kilo, Apogee Mind, Sarkhan the Masterless, and the many proliferate spells in these colors help you benefit from running planeswalkers