Mysteries of the Deep 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
Draw two cards. Landfall — If you had a land enter the battlefield under your control this turn, draw three cards instead.
Complete guide
Mysteries of the Deep is a powerful blue instant that rewards you for developing your board. By timing this spell correctly after playing a land, you can significantly increase your hand size at instant speed.
What It Does
Mysteries of the Deep is a draw spell with a Landfall rider. While its base effect allows you to draw two cards, it becomes much more efficient if a land entered the battlefield under your control at any point earlier in the turn. If that condition is met, the spell's effect is replaced, and you draw three cards instead.
Step-by-Step Resolution
When you cast the spell, it goes on the stack. Upon resolution, the game checks your turn history: did a land enter the battlefield under your control? It doesn't matter if that land was destroyed, bounced, or changed control later; the game only cares that the event occurred. If yes, you draw three cards. If no, you draw two cards. The spell then moves to the graveyard.
Common Mistakes
A frequent misconception is that multiple lands provide additional cards; however, having two or more lands enter only satisfies the single 'if' condition for three cards. Additionally, remember that Landfall is checked during resolution. If you cast this in response to a land-entry trigger that hasn't finished resolving yet, you might miss the bonus.
When to Play It
Because it is an instant, you can wait until your opponent's end step to cast it. However, to get the three-card Landfall bonus, you usually need to cast it on your own turn after playing a land, or use an effect that puts a land into play on an opponent's turn.
Interaction examples
Force of WillYou play a land during your main phase, then cast Mysteries of the Deep. Your opponent attempts to counter it. Because you have already met the Landfall condition, you can exile a blue card to cast Force of Will for its alternative cost to protect your spell. Once Force of Will resolves, Mysteries of the Deep will resolve and you will draw three cards.
AetherizeOn your opponent's turn, they attack with several creatures. You cast Aetherize to return them to their hand. Because no land entered the battlefield under your control this turn, if you then cast Mysteries of the Deep in your opponent's end step, you will only draw two cards.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Mysteries of the Deep
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
Whether you had a land enter the battlefield under your control this turn is checked as this spell resolves, not as you cast it.
No other card is named in this ruling.
- #2· Wizards of the Coast
Having more than one land enter the battlefield under your control this turn provides no additional benefit.
No other card is named in this ruling.
- #3· Wizards of the Coast
The landfall ability checks for an action that has happened in the past. It doesn't matter if a land that entered the battlefield under your control previously in the turn is still on the battlefield, is still under your control, or is still a land.
No other card is named in this ruling.
- #4· Wizards of the Coast
Once the spell resolves, having a land enter under your control provides no further benefit.
No other card is named in this ruling.
- #5· Wizards of the Coast
The effect of this spell's landfall ability replaces its normal effect. If you had a land enter under your control this turn, only the landfall-based effect happens.
No other card is named in this ruling.
Legal formats
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Meta decks with Mysteries of the Deep
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