Submerge

Settle {3}{u}{g} (You may cast this spell for its
settle cost. If you do, put it onto the battlefield as it
resolves. It becomes an Island.)
Put target noncreature permanent on the
bottom of its owner's library.
"When the stench of the sea and the absence of green
are the death of all things that are seen and unseen.
Not an end, but the start of all things that are left
to do." — Hozier, Wasteland, Baby!