How can you create a combo with Gwenna, Eyes of Gaea, Thornbite Staff, Bloodsoaked Champion, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Gwenna, Eyes of Gaea, Thornbite Staff, Bloodsoaked Champion, Altar of Dementia

Color identity: BG
Mana cost: 
Steps:
  1. Activate Altar of Dementia by sacrificing Bloodsoaked Champion.
  2. Bloodsoaked Champion dies, triggering Gwenna, untapping Gwenna.
  3. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Bloodsoaked Champion's power.
  4. Activate Gwenna by tapping it, adding {1}{B} that can only be spent to cast creature spells or activate abilities of creatures.
  5. Activate Bloodsoaked Champion by paying {1}{B}, returning it from your graveyard to the battlefield.
  6. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - All permanants must be on the battlefield
  - Thornbite Staff attached to Gwenna.
  - Gwenna does not have summoning sickness.
  - A creature has attacked this turn.
[END OF COMBO PREREQUISITES]
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