Foreboding Ruins itself is neither a Swamp nor a Mountain, even though it produces black and red mana, so you can't reveal one to satisfy the ability of another
As a four-mana aura, its good that you can technically use it in a fair way, slapping it onto something as a response opponents removing a different creature (or wiping the board)
Enduring Courage (Japan Showcase, Fracture Foil) $150.99 Perhaps the most dangerous among the Enduring cycle in the limited cycle, Enduring Courage gives all creatures that enters your side of the battlefield haste and +2/0, allowing players who successfully make use of this effect to a hasty beatdown of the opponent
Cards in hand just dont matter as much as threats on the table in efficient environments
If an opponent doesnt make a play worth interacting on, you instead can leap ahead with Memory Deluge or Thirst for Discovery on their end step, which easily digs you to your monster threats or situational blowouts like Blood on the Snow