Mikaeus, the Unhallowed + Bloodflow Connoisseur + Glen Elendra Archmage

Mikaeus, the Unhallowed

Bloodflow Connoisseur

Glen Elendra Archmage

How it works

1. Activate Bloodflow Connoisseur by sacrificing Glen Elendra Archmage.
2. When Glen Elendra Archmage 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 Glen Elendra Archmage.
5. When Glen Elendra Archmage 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.