Cast Momentary Blink by paying its mana cost, blinking Abdel Adrian.
Abdel Adrian leaves the battlefield, returning Invasion of Arcavios and all other cards that were exiled with it to the battlefield.
Abdel Adrian and Invasion of Arcavios trigger.
Resolve the Invasion of Arcavios trigger, returning Momentary Blink from your graveyard to your hand.
Holding priority, activate any number of nonland permanents you control by tapping them, adding at least enough mana to cast Momentary Blink.
Resolve the Abdel Adrian trigger, exiling Invasion of Arcavios and the mana-producing permanents until Abdel Adrian leaves the battlefield, and creating a 1/1 Soldier creature token for each permanent exiled this way.
Repeat.
This clever Commander loop hinges on Abdel Adrian, Gorion's Ward continuously resetting Invasion of Arcavios by exiling it and bringing it right back, triggering its tutor effect on every single iteration to pull Momentary Blink back from your graveyard into your hand. Because Invasion of Arcavios's back face, Invocation of the Founders, also doubles every instant or sorcery you cast from your hand, you aren't just endlessly recycling your spells—you're generating infinite Magecraft triggers, an infinite storm count, and an endless army of Soldier tokens. To fuel the engine, Abdel Adrian, Gorion's Ward conveniently vacuums up your mana-producing permanents alongside the Siege, letting you tap them for mana before exiling them anew so you can continuously recast and flashback Momentary Blink without ever running dry.