Necrotic Ooze + Hardened Scales + Cryptic Trilobite + Farmstead Gleaner + Walking Ballista

Necrotic Ooze
Hardened Scales
Cryptic Trilobite
Farmstead Gleaner
Walking Ballista

Requires
Necrotic Ooze must be on the battlefield. Hardened Scales must be on the battlefield. Cryptic Trilobite must be in the graveyard. Farmstead Gleaner must be in the graveyard. Walking Ballista must be in the graveyard.
Steps
  1. Pay 1 and tap Necrotic Ooze using the Trilobite's ability to put a +1/+1 counter on it.
  2. Hardened Scales doubles this.
  3. Remove 2 +1/+1 counters from Necrotic Ooze using the Trilobite's ability to generate 4 for activated abilities.
  4. Pay 2 and untap Necrotic Ooze using Farmstead Gleaner's ability and put 2 +1/+1 counters on Necrotic Ooze.
  5. You have 2 floating and Necrotic Ooze with 2 counters.
  6. Repeat to generate infinite for activated abilities, and Necrotic Ooze having infinite +1/+1 counters Remove counters from Necrotic Ooze using Walking Ballista's ability to ping an opponent.
  7. Repeat to ping your opponent to death.
Results
Infinite colorless mana for activated abilities. Infinite damage.

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