Berta, Wise Extrapolator, Agatha's Soul Cauldron, Farmstead Gleaner, and Clockwork Hydra

Prerequisites

• Berta, Wise Extrapolator on the battlefield
• Agatha's Soul Cauldron on the battlefield
• Farmstead Gleaner in exile
• Clockwork Hydra in exile
• available

Steps

1. Activate Berta using Clockwork Hydra's ability by tapping them, putting a +1/+1 counter on Berta
2. Berta's second ability triggers, adding one mana of any color
3. Activate Berta using Farmstead Gleaner's ability by paying and untapping them, putting a +1/+1 counter on Berta
4. Berta's second ability triggers, adding one mana of any color
5. Repeat

Results

• Infinite +1/+1 counters on a creature