Inexorable Tide + Crystalline Crawler + Pentad Prism + Whitemane Lion

Inexorable Tide

Crystalline Crawler

Pentad Prism

Whitemane Lion

How it works

1. Cast Whitemane Lion by paying 1.
2. Inexorable Tide triggers, putting a +1/+1 counter on Crystalline Crawler 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 Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding 1.
6. Repeat.

This loop is a masterclass in recycling, turning the simple act of casting a cat into an endless engine of growth and mana. You begin by casting Whitemane Lion, which immediately triggers Inexorable Tide to proliferate your board; this passive synergy effortlessly stacks fresh counters back onto Crystalline Crawler and Pentad Prism every single time a spell is cast. When the Lion hits the battlefield, its own entry trigger forces it to bounce itself right back to your hand, allowing you to pay its cost and repeat the cycle. Meanwhile, the mana you need to keep casting it is funded directly by dismantling your progress—filtering through Pentad Prism and draining a +1/+1 counter from Crystalline Crawler to generate the exact {1}{W} required to start anew.