Progenitor Mimic + Skullwinder + Notorious Throng

Progenitor Mimic

Skullwinder

Notorious Throng

How it works

1. Cast Notorious Throng by paying its mana cost, taking an extra turn after this one.
2. At the beginning of your next upkeep, Progenitor Mimic triggers, creating a token copy of Skullwinder.
3. When the token Skullwinder enters the battlefield, it triggers itself, returning Notorious Throng from your graveyard to your hand.
4. Repeat.

This engine kicks into gear the moment you resolve Notorious Throng to flood the board with Faerie Rogue tokens and buy yourself an extra turn. From there, Progenitor Mimic steps in as the master builder, copying Skullwinder and generating a fresh copy of the snake during each of your upkeeps since the base mimic isn't a token. Every time that Skullwinder token enters the battlefield, its triggered ability reaches into your graveyard to pull Notorious Throng right back to your hand, allowing you to recast it and chain infinite turns together while your opponents are forced to dig through their own yards.