How can you create a combo with Kenrith, the Returned King, Eternal Witness, Capture of Jingzhou, Ashnod's Altar?
user
[START OF COMBO]This combo can be formed with Kenrith, the Returned King, Eternal Witness, Capture of Jingzhou, Ashnod's Altar

Color identity: WUBRG
Mana cost: {5}{U}{U}{B} each turn
Steps:
  1. Activate Ashnod's Altar by sacrificing Eternal Witness, adding {C}{C}.
  2. Activate Kenrith's last ability by paying {4}{B}, returning Eternal Witness from your graveyard to the battlefield.
  3. Eternal Witness enters the battlefield, returning Capture of Jingzhou from your graveyard to your hand.
  4. Cast Capture of Jingzhou by paying {3}{U}{U}, causing you to take an extra turn after this one.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite turns[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Kenrith, the Returned King must be on the battlefield
  - Eternal Witness must be on the battlefield
  - Capture of Jingzhou must be in the graveyard
  - Ashnod's Altar must be on the battlefield
[END OF COMBO PREREQUISITES]
assistant