Evolution Witness + Iron Apprentice + Krark-Clan Ironworks
Evolution Witness
Iron Apprentice
Krark-Clan Ironworks
Infinite +1/+1 counters on a creatureInfinite creature LTBInfinite creature ETBInfinite creature sacrifice triggersInfinite death triggersInfinite storm countInfinite colorless mana
How it works
Cast Iron Apprentice by paying 1, causing it to enter the battlefield with a +1/+1 counter on it.
Activate Krark-Clan Ironworks by sacrificing Iron Apprentice, adding CC.
When Iron Apprentice dies, it triggers, putting a +1/+1 counter on Evolution Witness.
Evolution Witness triggers, returning Iron Apprentice from your graveyard to your hand.
Repeat.
This loop is a masterclass in artifact recursion, turning a tiny construct into an endless engine of value. By sacrificing Iron Apprentice to Krark-Clan Ironworks, you generate the colorless mana needed to recast it while safely transferring its counters. Those entering counters trigger Evolution Witness, whose passive ability immediately recycles Iron Apprentice right back from your graveyard to your hand.