Spider-Man India + Crystalline Crawler + Cloud Key + Whitemane Lion

Spider-Man India

Crystalline Crawler

Cloud Key

Whitemane Lion

How it works

1. Cast Whitemane Lion by paying .
2. Spider-Man India triggers, putting a +1/+1 counter on Crystalline Crawler.
3. When Whitemane Lion enters, it triggers, returning itself from the battlefield to your hand.
4. Activate Crystalline Crawler by removing a +1/+1 counter from it, adding .
5. Repeat.

This elegant loop turns a simple flash feline into an engine for infinite casts and enters-the-battlefield triggers. By naming "artifact" as Cloud Key's choice, Whitemane Lion becomes entirely free to cast for a single white mana, and its mandatory entry trigger conveniently picks itself right back up to your hand. Meanwhile, Spider-Man India rewards your endless creature casting by tossing a +1/+1 counter onto Crystalline Crawler every single time, fueling the crawler's ability to convert those counters directly back into the white mana you need to keep the web spinning.