How can you create a combo with The Book of Vile Darkness, Eye of Vecna, Hand of Vecna, True Polymorph, Bloodthirster?
user
[START OF COMBO]This combo can be formed with The Book of Vile Darkness, Eye of Vecna, Hand of Vecna, True Polymorph, Bloodthirster

Color identity: UBR
Mana cost: {4}{U}{U}
Steps:
  1. On the end step prior to your turn, cast True Polymorph by paying {4}{U}{U}, causing Bloodthirster to become a copy of Eye of Vecna.
  2. Activate The Book of Vile Darkness by tapping it and exiling it, Bloodthirster and Hand of Vecna, causing you to create a legendary 8/8 Vecna token that has all triggered abilities of the exiled cards.
  3. During your next turn, deal combat damage to an opponent using Vecna.
  4. Vecna triggers, causing you to untap it and to get an additional combat phase after this one.
  5. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite combat damage
  - Infinite combat phases[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - The Book of Vile Darkness must be on the battlefield
  - Eye of Vecna must be on the battlefield
  - Hand of Vecna must be on the battlefield
  - True Polymorph must be in your hand
  - Bloodthirster must be on the battlefield
  - An opponent cannot block creatures you control.
[END OF COMBO PREREQUISITES]
assistant