Some seemingly easy enough cards going from the most recent release back in time. Waiting on the merger of the following PR, #10740 , since it deals with a crash involving Bin Chicken's amass effect and it also updates the Un-card list. Also waiting on the merger of #10809 regarding the proper listing of non-legal subtypes per discussion below.

• 17-Year Cicadas and associated token: Tested to satisfaction
• Another Night in Vegas: Tested to satisfaction
• Auntie Ant, Ant Auntie: Since this is the only instance of the multiblight keyword, I opted to recreate it with a script line. Tested to satisfaction.
• Bin Chicken: Treating Food tokens as Junk and vice-versa was interpreted as two separate continuous effects granting one codified token the type and standard ability of the other. Tested to satisfaction except for the amass line as explained above. I do understand from testing done for the PR mentioned above that it should work.
• Colorless Ultimatum: The game engine converts the scripted {2}{C}{C}{C}{2} cost to {4}{C}{C}{C} with no issue. Maybe it's better to skip that calculation altogether? Tested to satisfaction.
• Crow Scarer and associated token: Tested to satisfaction.
• Drop Bear: Added Koala to TypeLists.txt the relevant edition file. Tested to satisfaction.
• Evy, Fang Keeper: In the vein of "Ach! Hans, Run!", skipped the somatic requirement (if you will) and set up a flavorful enough GenericChoice between the granted ETBs. Added Artist to TypeLists.txt the relevant edition file. Tested to satisfaction.
• The Ancient Dingus: Regarding the replacement effect, skipped the unsleeved card requirement as presumably extraneous to implement and had it pull cards into hand from the players' sideboards. Tested to satisfaction.
• The Bird Champion and associated token: Tested to satisfaction.
• The Cookout Creator and associated new token: Tested to satisfaction.
• The Goblin Mastermind: Tested to satisfaction.
• The Ice Dancer: Added Athlete to TypeLists.txt the relevant edition file. Tested to satisfaction.
• The Wizardly Barge: Assumed and noted as such that the "tournament-legal" requirement is extraneous to implement as it can be context-dependent. Tested to satisfaction.
• Wurmcoil Broodmother: Tested to satisfaction.