It doesnt have complex mechanics, confusing interactions, or clever tricks
Firion turns every Sword of This and That into a party
Some believe that Marina is the one person who would be able to defeat Valgavoth, but no one dares try to make her see the House as it really is, as disturbing her causes hordes of cellarspawn to converge on her location, killing all others in the vicinity so that she can maintain her ignorance of what the House has become
You can also win by drawing out your library, using Jace, Wielder of Mysteries' effect, or Laboratory Maniac's effect
Each of them makes a substantial splash when they come into play, enabling some nasty blue-black-red shenanigans befitting of the final battle in a Final Fantasy game
However, you must also sacrifice a creature to pay for the spell, and it generates three red mana