If that token was a merged creature, any cards that were part of it will be returned to the battlefield.
It's one of the best win conditions for the deck, making it trivial to win through combat damage with how many powerful Rats will be on the battlefield
When they have many this card has greatly reduced value and won't help your high value creatures to connect
Unlike Iona however Sheoldred does help you recover from behind and also offers plenty of value
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Legal Toolbox Buy This Card Notes and Rules Information for Jecht, Reluctant Guardian // Braska's Final Aeon: As Braska's Final Aeon's first or second chapter ability resolves, the next opponent in turn order (or, if it's an opponent's turn, that opponent) chooses a card in hand without revealing it, then each other opponent in turn order does the same
Vivi Ornitier's effect is so good, and can be copied onto other creatures (something Izzet Cauldron decks do in Standard), so they too can provide mana to make for explosive turns where you can play your entire hand and draw a bunch of cards
