Oracle

Land - Mountain 

(T: Add R.)
Dwarven Mine enters the battlefield tapped unless you control three or more other Mountains.
When Dwarven Mine enters the battlefield untapped, create a 1/1 red Dwarf creature token.

Tournooi-info

Legal in: Vintage, Legacy, Modern, Standard, Commander

Officiele rulings

10/4/2019
An Island is a land with the subtype Island, not any land that could produce blue mana. For example, Mystic Sanctuary is an Island, but Castle Vantress isn’t.

10/4/2019
As these lands are entering the battlefield, they check for lands that are already on the battlefield. They won’t see lands that are entering the battlefield at the same time (due to Scapeshift, for example).

10/4/2019
If another effect puts these lands onto the battlefield tapped, they enter tapped, even if you control enough lands with the appropriate basic land type.

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