Infinite +1/+1 counters on a creature, Infinite ETB, Infinite LTB, Infinite death triggers, Infinite sacrifice triggers
Activate Bloodflow Connoisseur by sacrificing Chaos Spewer.
When Chaos Spewer dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
When Chaos Spewer enters the battlefield, it triggers, putting a -1/-1 counter on it.
Resolve the Bloodflow Connoisseur ability
Repeat.
Component Cards
How It Works
Activate Bloodflow Connoisseur by sacrificing Chaos Spewer.
When Chaos Spewer dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
When Chaos Spewer enters the battlefield, it triggers, putting a -1/-1 counter on it.
Resolve the Bloodflow Connoisseur ability
Repeat.