Pir, Imaginative Rascal + Cryptic Trilobite + Diviner's Wand + Wizard Class

Pir, Imaginative Rascal

Cryptic Trilobite

Diviner's Wand

Wizard Class

How it works

1. Activate Cryptic Trilobite by paying 4, causing you to draw a card.
2. Cryptic Trilobite and Wizard Class trigger.
3. Resolve the Cryptic Trilobite trigger, giving it +1/+1 until end of turn.
4. Resolve the Wizard Class trigger, putting two +1/+1 counters on Cryptic Trilobite.
5. Activate Cryptic Trilobite twice by removing two +1/+1 counters from it, adding CCCC that can only be spent to activate abilities.
6. Repeat