Preston, the Vanisher | Fiend Hunter

Cards

Cast
Glimmerpoint Stag by paying ({2} magic symbol) ({W} magic symbol) ({W} magic symbol) .
When
Glimmerpoint Stag enters the battlefield, it triggers, exiling
Fiend Hunter until the next end step.
When
Fiend Hunter leaves the battlefield, its second ability triggers, returning all cards exiled with it to the battlefield under their owner's control.
At the beginning of your end step,
Glimmerpoint Stag triggers, returning
Fiend Hunter from exile to the battlefield.
When
Fiend Hunter enters the battlefield, its first ability and
Preston trigger.
Resolve the
Fiend Hunter trigger, exiling
Glimmerpoint Stag.
Resolve the
Preston trigger, creating a copy of
Fiend Hunter that is a 0/1 Illusion.
When the token
Fiend Hunter enters the battlefield, its first ability triggers, exiling the nontoken
Fiend Hunter until the token
Fiend Hunter leaves the battlefield.
When the nontoken
Fiend Hunter leaves the battlefield, its second ability triggers, returning
Glimmerpoint Stag from exile to the battlefield.
When
Glimmerpoint Stag enters the battlefield, it and
Preston trigger, with
Glimmerpoint Stag targeting the
Fiend Hunter token.
Resolve the
Preston trigger, creating a token copy of
Glimmerpoint Stag that is a 0/1 Illusion.
When the token
Glimmerpoint Stag enters the battlefield, it triggers, exiling the
Fiend Hunter token.
When the token
Fiend Hunter leaves the battlefield, its second ability triggers, returning the nontoken
Fiend Hunter from exile to the battlefield.
Repeat from step 5.

This combo has been estimated to be Exhibition (Bracket 1+).