This land enters tapped. Whenever a Mountain you control enters, if you control at least five other Mountains, you may have this land deal 3 damage to any target. {T}: Add {R}.
This land enters tapped. {T}: Add {U}. {U}, {T}: Put an eon counter on this land. Skip your next turn. {T}, Remove an eon counter from this land and return it to its owner's hand: Take an extra turn after this one.
This land enters tapped. At the beginning of your upkeep, if you control seven or more Plains, you may return target creature card from your graveyard to the battlefield. {T}: Add {W}.