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

Volrath, the Shapestealer

Psychic Frog

Evolution Witness

Cryptic Trilobite

How it works

1. Activate Volrath by paying 1, 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 1, 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 1, 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 CCCC that can only be spent to activate abilities.
9. Repeat.