You have any number of other nonland permanents that enter the battlefield untapped, and that can collectively tap to produce enough mana to cast Splash Portal exiled by Abdel Adrian.
Mnemonic Wall exiled by Abdel Adrian.
You have enough mana to cast Splash Portal.
Steps
Cast Splash Portal 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 Splash Portal 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 Splash Portal.
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.
Results
Infinite LTB.
Infinite ETB.
Infinite storm count.
Infinite creature tokens.
Infinite blinking of nonland permanents you control.