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

Color identity: WUB
Mana cost: {4}{U}{U}
Steps:
  1. On the end step prior to your turn, cast True Polymorph by paying {4}{U}{U}, causing Medomai to become a copy of Eye of Vecna.
  2. Activate The Book of Vile Darkness by tapping it and exiling it, Medomai 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 take an extra turn after this one.
  5. Repeat from step 3 during each of your turns.[END OF COMBO STEPS]

Result:
  - Infinite turns[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
  - Medomai the Ageless must be on the battlefield
  - An opponent cannot block creatures you control.
[END OF COMBO PREREQUISITES]
assistant