How can you create a combo with Astral Dragon, Necromancy, Clever Impersonator?
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[START OF COMBO]This combo can be formed with Astral Dragon, Necromancy, Clever Impersonator

Color identity: UB
Mana cost: {2}{B}
Steps:
  1. Cast Necromancy by paying {2}{B}.
  2. When Necromancy enters the battlefield, it triggers, returning Astral Dragon from your graveyard to the battlefield, and then attaching Necromancy to Astral Dragon.
  3. 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.
  4. When the Necromancy tokens enter the battlefield, they trigger, with at least one trigger targeting Clever Impersonator.
  5. 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.
  6. The Necromancy Aura creature token is put into your graveyard as a state-based action due to being an Aura that is unattached.
  7. The Necromancy token leaves-the-battlefield ability triggers, as well as Clever Impersonator's enters-the-battlefield ability.
  8. Resolve the Necromancy trigger, causing you to sacrifce Clever Impersonator.
  9. Resolve the Clever Impersonator trigger, creating two token copies of Necromancy that are 3/3 Dragon creatures in addition to their other types.
  10. Repeat from step 4.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Astral Dragon must be in the graveyard
  - Necromancy must be in your hand
  - Clever Impersonator must be in the graveyard
[END OF COMBO PREREQUISITES]
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