Cleric Class + Juju Bubble + Cryptic Trilobite

Cleric Class

Juju Bubble

Cryptic Trilobite

How it works

1. Activate Juju Bubble by paying 2, causing you to gain 2 life due to Cleric Class.
2. Cleric Class's second ability triggers, putting a +1/+1 counter on Cryptic Trilobite.
3. Activate Cryptic Trilobite by removing a +1/+1 counter from it, adding CC that can only be spent to activate abilities.
4. Repeat.