Volrath, the Shapestealer, Psychic Frog, Evolution Witness, and Cryptic Trilobite

Prerequisites

• Volrath, the Shapestealer on the battlefield
• Psychic Frog on the battlefield
• Evolution Witness on the battlefield
• Cryptic Trilobite on the battlefield
• available

Steps

1. Activate Volrath by paying , causing it to become a copy of Psychic Frog until your next turn
2. Activate Volrath using Psychic Frog's ability four times by discarding four cards
3. Holding priority, activate Volrath by paying , causing it to become a copy of Evolution Witness until your next turn
4. Resolve the first Volrath ability from step 2, putting a +1/+1 counter on it
5. Volrath triggers, returning a permanent card from your graveyard to your hand
6. Repeat steps 4 and 5 for each remaining ability
7. Activate Volrath by paying , causing it to become a copy of Cryptic Trilobite until end of turn
8. Activate Volrath using Cryptic Trilobite's ability twice by removing two +1/+1 counters from it, adding that can only be spent to activate abilities
9. Repeat

Results

• Infinite +1/+1 counters on a creature
• Infinite colorless mana that can only be spent to activate abilities
• Infinite self-discard triggers