Mishra, Eminent One | Gonti's Aether Heart

Cards

At the beginning of your combat phase,
Mishra and
Determined Iteration trigger.
Resolve the
Mishra trigger, creating a 4/4 artifact creature token copy of
Gonti's Aether Heart named
Mishra's Warform.
When
Mishra's Warform enters the battlefield, it and
Gonti's Aether Heart trigger, causing you to get four ({E} magic symbol) .
Resolve the Determined iteration trigger, creating a token copy of the
Mishra's Warform token.
When the copy of the
Mishra's Warform token enters the battlefield, it,
Mishra's Warform and
Gonti's Aether Heart trigger, causing you to get six ({E} magic symbol) .
Activate
Mishra's Warform by paying eight ({E} magic symbol) and exiling it, causing you to take an extra turn after this one.
Repeat each turn.

This combo has been estimated to be Ruthless (Bracket 4+).