Abdel Adrian, Gorion's Ward | Phantom Steed | Spark Double

Cards

Cast
Phantom Steed by paying ({3} magic symbol) ({U} magic symbol) .
When
Phantom Steed enters the battlefield, its first ability triggers, exiling
Abdel Adrian until
Phantom Steed leaves the battlefield.
Abdel Adrian leaves the battlefield, ending its effect, causing
Spark Double to return from exile to the battlefield as a copy of
Phantom Steed.
When
Spark Double enters the battlefield, its first ability triggers, exiling
Phantom Steed until
Spark Double leaves the battlefield.
Phantom Steed 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
Spark Double 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.
Spark Double leaves the battlefield, ending its effect, causing
Phantom Steed to return to the battlefield from exile.
Repeat from step 2.