When Lumbering Battlement enters the battlefield, it triggers, exiling Abdel Adrian until Lumbering Battlement leaves the battlefield.
Abdel Adrian leaves the battlefield, ending its effect, causing Clever Impersonator to return from exile to the battlefield as a copy of Lumbering Battlement.
When Clever Impersonator enters the battlefield, it triggers, exiling Lumbering Battlement until Clever Impersonator leaves the battlefield.
Lumbering Battlement leaves the battlefield, ending its effect, causing Abdel Adrian to return from exile to the battlefield.
When Abdel Adrian enters the battlefield, it triggers, exiling Clever Impersonator and any number of other nonland permanents you control until Abdel Adrian leaves the battlefield and creating at least one 1/1 Soldier creature token.
Clever Impersonator leaves the battlefield, ending its effect, causing Lumbering Battlement to return to the battlefield from exile.
Repeat from step 2.
This brilliant loop plays out as an endless dance between Abdel Adrian, Gorion's Ward and Lumbering Battlement, with Clever Impersonator acting as the ultimate mirror to keep the cascade moving. When Lumbering Battlement enters to exile Abdel Adrian, it triggers a clean break that drops Clever Impersonator—configured as another copy of Lumbering Battlement—right back into the fray to catch Lumbering Battlement in turn. Because Abdel Adrian returns every time the cycle resets to scoop up your other nonland permanents, you get an unstoppable engine that endlessly blinks your board while flooding the battlefield with an infinite army of Soldier tokens.