Mishra, Eminent One | Gonti's Aether Heart | Delina, Wild Mage

Cards

At the beginning of your combat phase,
Mishra triggers, 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 energy counters.
Declare
Delina as an attacker.
Delina triggers, creating at least one nonlegendary token copy of
Mishra's Warform that is tapped and attacking.
When the nonlegendary
Mishra's Warform enters the battlefield, it, the legendary
Mishra's Warform, and
Gonti's Aether Heart trigger, causing you to get six energy counters.
Activate a
Mishra's Warform by paying eight energy counters and exiling it, causing you to take an extra turn after this one.
Repeat each turn.