Volrath, the Shapestealer, Psychic Frog, Evolution Witness, and Crystalline Crawler

Prerequisites

• Volrath, the Shapestealer on the battlefield
• Psychic Frog on the battlefield
• Evolution Witness on the battlefield
• Crystalline Crawler 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 Crystalline Crawler until end of turn
8. Activate Volrath using Crystalline Crawler's ability three times by removing three +1/+1 counters from it, adding
9. Repeat

Results

• Infinite colored mana
• Infinite +1/+1 counters on a creature
• Infinite self-discard triggers