Choosing a creature isnt the same as targeting a creature, which means you can choose a shroud creature when you have to sacrifice
It will often cost a mere 2 white mana, making it one of the most efficient sweepers in the format
So far, the likes of Pikachu, Bulbasaur, Snorlax, Charizard, Vaporeon, Moltres, Haunter, Meowth and more have been confirmed to appear
Food by itself isnt a great mechanic but remember that it counts as an Artifact, giving Oko surprising synergy
Even without those ramp effects, this costs just one more mana than Teferi himself, and its going to draw a ton of cards very quickly
Unfortunately they still have strict rules when it comes to double sleeving, much worse than any other card game out there