Always a Bigger Fish

{1}{g}: Sacrifice a creature then reveal cards from
the top of your library until you reveal a creature
with greater mana value, put that creature onto
the battlefield. Activate this ability only any time
you could cast a sorcery, and only once each turn.
"All the world is as an ocean, tranquil stillness punctuated by great and terrible rage"
—Shukana, Insight of the Deep