Requires

Lost Jitte must be on the battlefield. Karn's Bastion must be on the battlefield. Cryptic Trilobite must be on the battlefield. Benevolent Hydra must be on the battlefield. Lost Jitte has at least one charge counter on it. Cryptic Trilobite has at least one +1/+1 counter on it. Mana needed:

Steps

1. Activate Karn's Bastion by paying , putting a charge counter on Lost Jitte and two +1/+1 counters on Cryptic Trilobite.
2. Activate Cryptic Trilobite's first ability twice by removing two +1/+1 counters from it, adding that can only be spent to activate abilities.
3. Activate Lost Jitte by removing a charge counter from it, untapping Karn's Bastion.
4. Repeat.

Results