If you enjoy playing alternative MTG formats like Penny Dreadful, Heirloom, Pauper, Tribal Apocalypse, or Pre‑modern on Magic: The Gathering Online, check out Gatherling. It’s built for player‑run tournaments and has impressive stats: over 74,000 unique decks and 218,000+ matches logged.

It features:

• A full deck‑search function and meta overview.
• Event listings for many niche formats.
• Profiles, ratings, and participation history.
• Direct login via Discord or local credentials.

Useful Discord communities for each format:

• Penny Dreadful MTG: https://discord.gg/RxhTEEP
• Heirloom: https://discord.gg/WdJvQNz
• Gatherling Pauper PRE: https://discord.gg/xAftRxG
• Tribal Apocalypse: https://discord.gg/VCBJ8TW
• Tropical Pauper: https://discord.gg/az2StMw
• Community Premodern Series: https://discord.gg/CtgF88f

Some of these servers may be inactive, but they’re still worth checking out.

Related tools:

• MTG Deck Validator (hosted at https://badaro.github.io/validator/) — lets you check a deck list against format definitions.
• MTG Legality Checker — a web‑app‑based legality checker for custom MTG formats.