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
Cards in hand just dont matter as much as threats on the table in efficient environments
pirates gambled with a djinn and lost the thing more dear than gold. "Love Song of Night and Day" Illustrated by Jock Part of the Reserved List Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
Eladamris Call In what may be the most basic non-permanent creature tutor, Eladamri's Call functions as a Demonic Tutor for creatures only, in that its a 2-mana spell to fetch something specific from your library
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
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)