Den of the Bugbear

Type: Land
Set: Adventures in the Forgotten Realms Promos #254p (rare)
Price: $4.49 USD

If you control two or more other lands, this land enters tapped.
{T}: Add {R}.
{3}{R}: Until end of turn, this land becomes a 3/2 red Goblin creature with "Whenever this creature attacks, create a 1/1 red Goblin creature token that's tapped and attacking." It's still a land.

Den of the Bugbear has 6 printings, first in Adventures in the Forgotten Realms (2021). EDHREC ranks it #3,057 among Commander cards. It appears most in Krenko, Mob Boss decks (12,953 on EDHREC). 1 public deck on TCG runs it. It has 3 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: legal
pioneer: legal
standard: not legal
brawl: legal

Public decks that run Den of the Bugbear

Goblin Storm Secret Lair Commander, led by Zada, Hedron Grinder

Commanders that run Den of the Bugbear most

Deck counts from EDHREC.

Krenko, Mob Boss: 12,953 decks
Zada, Hedron Grinder: 3,470 decks
Isshin, Two Heavens as One: 1,962 decks
Grub, Storied Matriarch // Grub, Notorious Auntie: 1,195 decks
General Kreat, the Boltbringer: 1,107 decks
Muxus, Goblin Grandee: 1,014 decks
Wort, Boggart Auntie: 951 decks
Norin the Wary: 900 decks

Often played with Den of the Bugbear

Cards that show up in the same decks on EDHREC.

Rulings

2021-07-23: If Den of the Bugbear enters the battlefield at the same time as one or more other lands, it doesn't take those lands into consideration when determining how many other lands you control.
2021-07-23: If you turn Den of the Bugbear into a creature but haven't controlled it continuously since your most recent turn began, you won't be able to activate its mana ability or attack with it.
2021-07-23: If Den of the Bugbear's last ability is activated multiple times in one turn, it will have multiple instances of the triggered ability that it grants. For example, if you activate it twice and attack, you will create two 1/1 red Goblin creature tokens that are tapped and attacking.