Infinite +1/+1 counters on a creatureInfinite creature ETBInfinite creature LTBInfinite death triggersInfinite magecraft triggersInfinite recursion of creature cards in your graveyardInfinite creature sacrifice triggers
How it works
Cast Leonardo's Technique by paying its mana cost, targeting any applicable target.
Holding priority, cast Dualcaster Mage by paying its mana cost.
When Dualcaster Mage enters, it triggers, targeting Leonardo's Technique.
Holding priority, activate Bloodflow Connoisseur by sacrificing Dualcaster Mage.
Resolve the Dualcaster Mage trigger, copying Leonardo's Technique, with the copy targeting Dualcaster Mage
Resolve the Leonardo's Technique copy, returning Dualcaster Mage from your graveyard to the battlefield.