Undergrowth Stadium - [Extended Art] Commander Legends (CMR)Undergrowth Stadium enters the battlefield tapped unless you have two or more opponents. {T}: Add {B} or {G}.

there is an additional combat phase

They phase in before you untap during your untap step

" Tap an untapped artifact you control: Add {U}

{T}: Add {C}

you may put a permanent card with equal or lesser mana value from your hand onto the battlefield

Sacrifice Bloodstained Mire: Search your library for a Swamp or Mountain card

savage and pure

Spend this mana only to cast a creature spell of the chosen type

Creatures you control have menace

The more markets you are serving

reveal them

1x Alt-Art Goblin King