Vizier of Remedies + Grazing Kelpie + Phantom Train
Vizier of Remedies
Grazing Kelpie
Phantom Train
Infinite +1/+1 counters on a creatureInfinite creature ETBInfinite creature LTBInfinite death triggersInfinite creature sacrifice triggers
How it works
Activate Phantom Train by sacrificing Grazing Kelpie.
When Grazing Kelpie dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Vizier of Remedies.