Grozoth

Most tutors fetch one card; this one empties a shelf. The enters trigger searches for any number of mana-value-nine cards and puts every one it finds into your hand, a deliberate joke that only pays off if you've stacked your deck with nines. The transmute clause is the punchline: discard Grozoth for at sorcery speed and tutor up another nine-mana card (often a second Grozoth, or the haymaker you actually want), making the Leviathan both the engine and the fuel that finds the engine. None of this matters unless you go all in. A 9/9 with defender can't profitably attack until you've sunk into it, so the body is an afterthought; the card is a deckbuilding prompt wearing a creature's clothes. It rewards a particular brewer's masochism: assemble a critical mass of nine-mana payoffs, then use transmute as a cheap dig that converts a dead late-game bomb into your actual plan before you ever pay full price for it. Transmute normally trades a card for a flexible search at its own mana value; here the value tutored is enormous, and resolving the creature refills your grip with every nine-drop you own. Note the catch the trigger hides in plain sight: those nines land in hand, still waiting on the mana to cast them, so the search is a promissory note, not a payoff. It is a parasitic build-around whose ceiling is entirely a function of how committed you are to the bit.