Castle Garenbrig enters tapped unless you control a Forest. : Add . , : Add six . Spend this mana only to cast creature spells or activate abilities of creatures.
Without Garenbrig's strength, the realm would succumb to the wilds.
Although the common lands have basic land types, they aren't basic lands.
04-10-2019
wotc
The mana generated by Castle Garenbrig's last ability can't be spent to activate abilities of creature cards that aren't on the battlefield.
04-10-2019
wotc
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.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.