This list wins by taking advantage of Polymorph to consistently tutor out Hullbreaker Horror. This means that you can generate infinite mana through Urza’s outlet and bounce all non-land permanents and spells to their owner’s hands if you have multiple cheap mana rocks.

This infinite mana paired with the right cards can win by milling all of your opponents with Timetwister, creating infinite 2/2 birds with Swan Song through Dramatic Reversal, or creating infinite construct tokens by bouncing Urza with Chain of Vapor.

This deck has a serious learning curve but is extremely fun to pilot and win with.

A similar deck with extensive primer can be found here:
https://www.moxfield.com/decks/kes83-onUU6X_H-RyM8HPw/primer