Berta, Wise Extrapolator + Agatha's Soul Cauldron + Farmstead Gleaner + Immaculate Magistrate

Prerequisites

• You control at least one Elf.
• There is at least one +1/+1 counter on Berta.
• Berta does not have summoning sickness.

Steps

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

Effects

• Infinite +1/+1 counters on a creature