If you cast it for nine, it becomes a game-ending threat that your opponents must answer right away, but even at four or five mana it's fantastic for a bunch of popular red strategies
The Legends Experience Step 1: Get Your Box Legends launches as a single, limited drop that's intentionally scarce
THE DARK ART OF OPTIMAL RESOURCE EFFICIENCY The fundamental logic for building around discard effects is similar to that of sacrifice you take something normally considered a drawback by the designers and then try to flip into either a neutral or even positive exchange
No need to find any screws or tools to assemble
You can also dump seven mana into Gix and discard X card to steal the top X cards of their deck for yourself, letting you cast spells and play lands for as long as those cards are in exile
I particularly like Order/Chaos as a combination defensive/offensive card for Squirrel decks, and have recently tried to put Guided Passage to good Squirrel use