Castle Embereth
Land
This land enters tapped unless you control a Mountain.
: Add 
.
, : Creatures you control get +1/+0 until end of turn.
Without Embereth's courage, the realm would falter and fall.
Illustrated by
Throne of Eldraine#239RareEnglishLegality
Rulings
Oct 4, 2019
Once the common lands (such as Mystic Sanctuary) enter the battlefield tapped, there's no way to untap them with a spell or ability to make their last ability trigger.
Oct 4, 2019
Although the common lands have basic land types, they aren't basic lands.