Rain of Riches is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
When this enchantment enters, create two Treasure tokens. The first spell you cast each turn that mana from a Treasure was spent to cast has cascade. (When you cast the spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)
Complete guide
Rain of Riches is a powerful red enchantment that turns your stockpiled wealth into an avalanche of spells. By utilizing Treasure tokens to pay for your spells, you can trigger the cascade keyword to pull extra value directly from your library.
A Wealth of Opportunities
When Rain of Riches enters the battlefield, you immediately create two Treasure tokens. These tokens can be sacrificed to add one mana of any color. The core of this card is its static ability: the very first spell you cast during a turn gains cascade, provided at least one mana from a Treasure was spent to cast it. Note that this applies to any turn, including your opponents' turns if you are casting spells with flash.
Cascading Step-by-Step
To trigger the effect, you must spend Treasure mana while paying the costs of your first spell. Once the spell is cast, the cascade trigger goes on the stack above it. You exile cards from the top of your library until you hit a nonland card with a lower mana value. You may then cast that second spell for free. Finally, all other exiled cards are placed on the bottom of your library in a random order.
Common Mistakes to Avoid
The most common error is forgetting that this only applies to the first spell you cast each turn. If you cast a spell using regular lands first, and then cast a second spell using Treasures, that second spell will not gain cascade. Additionally, if the spell you cascade into also costs mana, spending Treasure on that 'free' spell won't trigger another cascade from Rain of Riches, as it is no longer the first spell cast that turn.
Interaction examples
You have Rain of Riches on the battlefield and two Treasure tokens. You cast Purphoros, God of the Forge (mana value 4) as your first spell of the turn, sacrificing one Treasure for red mana. Cascade triggers. You exile cards until you find a nonland card with mana value 3 or less. You cast that card for free, and both spells will eventually resolve, with Purphoros potentially seeing the cascaded card enter if it is a creature.
You cast Warstorm Surge as your first spell using a Treasure. Cascade triggers, exiling cards until you hit a creature card. Because cascade happens 'when you cast' the spell, you will cast the creature before Warstorm Surge even resolves. Consequently, the creature enters the battlefield before Warstorm Surge is there to see it, so no damage will be dealt by the Surge's ability in this specific sequence.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Rain of Riches
Original English text — Wizards of the Coast / Scryfall
No additional ruling has been published for this card.
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Meta decks with Rain of Riches
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Treasure
Purphoros, God of the Forge
Warstorm Surge