Lethal Vapors - [Foil] Scourge (SCG)Whenever a creature enters the battlefield, destroy it. {0}: Destroy Lethal Vapors. You skip your next turn. Any player may activate this ability. The vapors infiltrate every crevice, poison every lung, and snuff out every life.

Flying When Reiver Demon enters the battlefield

the Collector enters the battlefield

Spend this mana only to cast your commander

if you control at least five other Mountains

They return to homelands forgotten

you may search your library for any number of Spirit cards

Trample {G}: Regenerate Silvos

that player puts the cards in their hand on the bottom of their library in any order

and together we will drive out this darkness

Under its mists

Ugin's Construct

then draws seven cards