Cast Flicker of Fate by paying its mana cost, blinking Abdel Adrian.
Abdel Adrian leaves the battlefield, returning Mnemonic Wall and all other cards that were exiled with it to the battlefield.
Abdel Adrian and Mnemonic Wall trigger.
Resolve the Mnemonic Wall trigger, returning Flicker of Fate 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 Flicker of Fate.
Resolve the Abdel Adrian trigger, exiling Mnemonic Wall 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 loop uses Abdel Adrian, Gorion's Ward as a recursive engine, starting the chain when you cast Flicker of Fate to blink him. As Abdel leaves and re-enters the battlefield, his ability scoops up Mnemonic Wall along with any of your mana-producing nonland permanents, creating an army of 1/1 Soldier tokens in the process. When Mnemonic Wall hits the board alongside Abdel Adrian, its triggered ability lets you fish Flicker of Fate right back out of your graveyard to hand. Tapping your accumulated permanents for mana before they get re-exiled pays for the next Flicker of Fate, sustaining an infinite cycle of entry and exit triggers.