Preston, the Vanisher + Fiend Hunter + Bloodflow Connoisseur + Chord of Calling
Preston, the Vanisher
Fiend Hunter
Bloodflow Connoisseur
Chord of Calling
Infinite +1/+1 counters on a creatureInfinite creature ETBInfinite creature LTBInfinite creature tokensInfinite death triggersInfinite recursion of creature cards in your graveyardInfinite creature sacrifice triggers
How it works
Cast Chord of Calling by paying at most 3, searching your library for Fiend Hunter and putting it onto the battlefield.
When Fiend Hunter enters, it and Preston trigger.
Resolve the Fiend Hunter trigger, exiling another creature if needed.
Resolve the Preston trigger, creating a token copy of Fiend Hunter that is a 0/1 Illusion.
When the Fiend Hunter token enters, it triggers, exiling the nontoken Fiend Hunter.
Activate Bloodflow Connoisseur by sacrificing the Fiend Hunter token
When the Fiend Hunter token dies, it triggers, returning Fiend Hunter from exile to the battlefield.