Prototype Portal | Gonti's Aether Heart | Thopter Assembly

(and one other card)

At the beginning of your upkeep,
Thopter Assembly triggers.
Holding priority, activate
Prototype Portal by paying ({6} magic symbol) and tapping it, creating a token copy of
Gonti's Aether Heart.
Gonti's Aether Heart enters the battlefield, causing you to get ({E} magic symbol) ({E} magic symbol) .
Resolve the
Thopter Assembly trigger, returning it from the battlefield to your hand and creating five 1/1 Thopter artifact creature tokens.
The Thopters enter the battlefield, triggering
Gonti's Aether Heart five times, causing you to get ten ({E} magic symbol) .
Activate
Krark-Clan Ironworks five times by sacrificing the five Thopters, adding ten ({C} magic symbol) .
Cast
Thopter Assembly by paying ({6} magic symbol) .
Thopter Assembly enter the battlefield, triggering
Gonti's Aether Heart, causing you to get ({E} magic symbol) ({E} magic symbol) .
Activate
Gonti's Aether Heart by paying eight ({E} magic symbol) and exiling it, causing you to take an extra turn after this one.
Repeat each turn.