Evolution Witness, Agatha's Soul Cauldron, and Psychic Frog

Prerequisites

• Evolution Witness on the battlefield
• Agatha's Soul Cauldron on the battlefield
• Psychic Frog in exile
• You have at least one permanent card in hand
• Evolution Witness has at least one +1/+1 counter on it

Steps

1. Activate Evolution Witness using Psychic Frog's first ability by discarding a permanent card, putting a +1/+1 counter on Evolution Witness
2. Evolution Witness triggers, returning the permanent card from your graveyard to your hand
3. Repeat

Results

• Infinite +1/+1 counters on Evolution Witness
• Infinite self-discard triggers