Mikaeus, the Unhallowed + Bloodflow Connoisseur + Obstinate Gargoyle

Mikaeus, the Unhallowed

Bloodflow Connoisseur

Obstinate Gargoyle

How it works

1. Activate Bloodflow Connoisseur by sacrificing Obstinate Gargoyle.
2. When Obstinate Gargoyle dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. Resolve the Bloodflow Connoisseur ability.
4. Activate Bloodflow Connoisseur by sacrificing Obstinate Gargoyle.
5. When Obstinate Gargoyle dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
6. Resolve the Bloodflow Connoisseur ability.
7. Repeat.