This land enters tapped unless you have two or more opponents.
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Undergrowth Stadium is one of the best dual lands available to BG decks, and it's a near-auto-include in the format it was designed for.
The genius is the activation condition: it enters untapped as long as you have two or more opponents — which is the default state of any multiplayer Commander game. So unlike a tapland or a slow shockland, this is functionally an untapped dual the moment it hits the battlefield. No life loss, no fetch synergy needed, no basic-land-typing concerns. It just fixes Golgari mana cleanly.
Play it in essentially any black-green deck: Meren, Muldrotha, Korvold, Slimefoot, aristocrats, +1/+1 counters, graveyard value piles. If your deck runs Swamps and Forests, this slot belongs to the Stadium.
The only time to skip it: heavy fetchland or "Glacial Fortress"-style typed-dual shells where you specifically need Swamp/Forest subtypes for fetches or landfall triggers — Stadium has no basic types. Also irrelevant in 1v1 Commander, where it just enters tapped.
Count the number of opponents you currently have, not how many you started with. If your four-player game is down to you and a single opponent, the land enters the battlefield tapped.
If an effect puts the land onto the battlefield tapped, having two or more opponents won't untap it.
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