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

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 Port Razer to become a copy of Eye of Vecna.
  2. Activate The Book of Vile Darkness by tapping it and exiling it, Port Razer 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 each creature you control 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
  - Infinite mana creatures you control can produce
  - Infinite untap of creatures you control[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
  - Port Razer must be on the battlefield
  - An opponent cannot block creatures you control.
[END OF COMBO PREREQUISITES]
assistant