Astral Dragon | Necromancy | Clever Impersonator

Cards

Cast
Necromancy by paying ({2} magic symbol) ({B} magic symbol) .
When
Necromancy enters the battlefield, it triggers, returning
Astral Dragon from your graveyard to the battlefield, and then attaching
Necromancy to
Astral Dragon.
When
Astral Dragon enters the battlefield, it triggers, creating two token copies of
Necromancy that are 3/3 Dragon creatures in addition to their other types.
When the
Necromancy tokens enter the battlefield, they trigger, with at least one trigger targeting
Clever Impersonator.
Resolve the first
Necromancy trigger, returning
Clever Impersonator from your graveyard to the battlefield as a copy of
Astral Dragon, and not attaching
Necromancy to
Clever Impersonator due to
Necromancy being a creature.
The
Necromancy Aura creature token is put into your graveyard as a state-based action due to being an Aura that is unattached.
The
Necromancy token leaves-the-battlefield ability triggers, as well as
Clever Impersonator's enters-the-battlefield ability.
Resolve the
Necromancy trigger, causing you to sacrifce
Clever Impersonator.
Resolve the
Clever Impersonator trigger, creating two token copies of
Necromancy that are 3/3 Dragon creatures in addition to their other types.
Repeat from step 4.