Havi, the All-Father, Sakashima the Impostor, and Bloodflow Connoisseur

Prerequisites

• Havi, the All-Father on the battlefield
• Sakashima the Impostor on the battlefield
• Bloodflow Connoisseur on the battlefield

Steps

1. Activate Bloodflow Connoisseur by sacrificing Sakashima the Impostor
2. When Sakashima the Impostor dies, it and Havi trigger
3. Resolve the Havi trigger, returning Sakashima the Impostor from your graveyard to the battlefield as a copy of Havi
4. Resolve the Sakashima the Impostor trigger, returning any legendary creature card with mana value 5 or less from your graveyard to the battlefield
5. Resolve the Bloodflow Connoisseur ability, putting a +1/+1 counter on it
6. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters on Bloodflow Connoisseur
• Put all legendary creature cards with mana value 5 or less from your graveyard onto the battlefield