You must target six different creatures
I think the one thing I would've liked to see more of in the list are summon cards: if you look at our commander options, Tidus, Yuna's Guardian and Yuna, Grand Summoner, both clearly work exceptionally well with the new summon creatures like Summon: Valefor as Tidus can remove lore counters to keep them around longer and Yuna can pump up creatures when the summons die, and that's a unique new game design space that would differentiate the deck from more generic +1/+1 Counter lists out there
However, on modern cards, it can be found alongside other identifying information in the cards bottom-left corner
Keep in mind that this will require you to have the corresponding card in your MTGA collection or to have wildcards available to craft them, so there may be some extra work involved
Warmaster + Druid + the token it makes is the exact three Elves you need to use the Druid
Victini 172/086 Victinis White Flare Black White Rare edition has become a surprise high roller