Don't worry, the poll will be back next episode with a ton of sweet new Dominaria options
The key difference between the two cards, is that Transmogrify exiles the targeted creature, while Polymorph destroys it, meaning death triggers wont be activating this time around
The multicolor cards leave a bit to be desired however and dont grant as good of payoffs as the previous two Guilds
Thats a lot of smart game design at work to ensure that games are fun, choices are meaningful, and players wont be punished for trying to do the cool new thing
Youll mostly see it during new set pre-releases, where local game stores will carve out a time slot for a 2HG event, but you could also play Commander 2HG, Standard 2HG, and so on