Gonti's Aether Heart | Mishra, Eminent One | Urza, Prince of Kroog

Cards

At the beginning of combat,
Mishra triggers, creating a 4/4 artifact creature token copy of
Gonti's Aether Heart named
Mishra's Warform.
Mishra's Warform enters the battlefield, triggering itself and
Gonti's Aether Heart, causing you to get four energy counters.
Activate
Urza by paying ({6} magic symbol) , creating a 3/3 Soldier artifact creature token copy of
Gonti's Aether Heart.
Put the token copy of
Gonti's Aether Heart into the graveyard due to the legend rule.
The
Gonti's Aether Heart token entering the battlefield triggers
Mishra's Warform and
Gonti's Aether Heart and itself, causing you to get six energy counters.
Activate
Mishra's Warform by paying eight energy counters and exiling it, taking an extra turn after this one.
Repeat each turn.