Inexorable Tide + Pentad Prism + Workhorse + Whitemane Lion

Inexorable Tide

Pentad Prism

Workhorse

Whitemane Lion

How it works

1. Cast Whitemane Lion by paying 1.
2. Inexorable Tide triggers, putting a +1/+1 counter on Workhorse and a charge counter on Pentad Prism.
3. When Whitemane Lion enters the battlefield, it triggers, returning itself from the battlefield to your hand.
4. Activate Pentad Prism by removing a charge counter from it, adding .
5. Activate Workhorse by removing a +1/+1 counter from it, adding C.
6. Repeat.

This ingenious loop relies on Whitemane Lion's self-bouncing entry to continuously re-trigger Inexorable Tide, which rewards every cast by proliferating counters back onto your board. Those proliferating triggers effortlessly recharge both Pentad Prism and Workhorse, restoring the exact mana and counter resources you spent to cast the Lion in the first place. With Pentad Prism providing colored mana and Workhorse feeding colorless energy, you have a completely self-sustaining engine that keeps the cat bouncing indefinitely.