Ayli, Eternal Pilgrim will allow you sacrifice a creature, but you must pay 1 to do it
But Hasbro had their own R&D department, and we were told if we came up with any games not appropriate for Wizards, we could pitch them to Hasbro R&D
In a nutshell, if you are new to MTGA, claim as many Arena codes as you can so you can open packs, build them into your decks to complete the daily quests , then go for Jump In
Vazi is halfway between a group hug and group slug deck, helping your opponents cast spells, but ideally, being built so you can punish your opponent at the same time
If you can get a copy of Unpredictable Cyclone on the battlefield and cycle Street Wraith, the results are anything but unpredictable: you'll end up with an Emrakul, the Aeons Torn (which you get to cast, giving you an extra turn!) 100% of the time