Omniscience 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
You may cast spells from your hand without paying their mana costs.
Complete guide
Omniscience is the ultimate dream for any blue mage, offering a glimpse into true power by removing the burden of mana. Once this enchantment hits the battlefield, your hand becomes a library of free spells waiting to be unleashed. It is a high-cost investment that promises to end the game by allowing you to bypass the traditional economy of Magic: The Gathering.
Unlocking the Archive
Omniscience provides a continuous effect that allows you to cast spells from your hand without paying their mana costs. This applies to any spell type—creatures, sorceries, instants, or even other enchantments. However, it is important to remember that this only affects spells cast from your hand; it does not apply to spells cast from your graveyard, exile, or the command zone.
Timing and Costs
While the mana cost is waived, all other rules for casting spells remain in effect. You must still follow timing restrictions, meaning you can only cast sorceries during your main phase when the stack is empty. Additionally, if you cast a spell without paying its mana cost, you cannot choose to pay alternative costs (like Mutate or Overload). You can, however, choose to pay optional additional costs like Kicker, and you must pay any mandatory additional costs required by the spell's text.
Priority and Resolution
Step by step, when Omniscience resolves, the active player (usually you) receives priority. This is crucial because it allows you to cast your first free spell before any opponent has a chance to use a removal spell like Disenchant on Omniscience. Once you announce a spell and move it to the stack, it doesn't matter if Omniscience is later destroyed; that specific spell has already been legally cast for free.
The Value of X
A common mistake involves spells with {X} in their mana cost. When casting such a spell using Omniscience's alternative cost of 'without paying its mana cost,' you are not paying mana, so the only legal choice for the value of X is 0. If you wish for X to be any other number, you must decline the free cast and pay the full mana cost of the spell normally.
Interaction examples
Mirror Room // Fractured RealmWith Omniscience on the battlefield, you can cast Mirror Room // Fractured Realm from your hand for free. If you cast the Fractured Realm half, its static ability will cause any of your triggered abilities to trigger an additional time. This sets the stage for massive turns where every subsequent free spell you cast generates double the value.
Summon: BahamutYou can use Omniscience to cast Summon: Bahamut for zero mana. As it enters, its first lore counter ability triggers. Because you didn't spend your mana on the Saga, you still have all your lands untapped to protect your new Dragon or cast other spells, effectively bypassing the heavy 9-mana requirement of the creature.
After casting Omniscience, you free-cast Summon: Bahamut and the Fractured Realm side of the Room card. When Summon: Bahamut reaches its IV chapter, the 'Mega Flare' triggers. Because of Fractured Realm, Mega Flare triggers twice. Each trigger deals damage to your opponents equal to the total mana value of your permanents. Since Omniscience has a mana value of 10, Bahamut's flare will be devastatingly powerful.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Omniscience
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
You must follow the normal timing permissions and restrictions of each spell you cast.
No other card is named in this ruling.
- #2· Wizards of the Coast
If you cast a spell "without paying its mana cost," you can't choose to cast it for any alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, such as that of Tormenting Voice, those must be paid to cast the spell.
No other card is named in this ruling.
- #3· Wizards of the Coast
If a spell has
in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.No other card is named in this ruling.
- #4· Wizards of the Coast
Once you cast Omniscience, if it's your turn, you'll have priority immediately after it resolves. You can cast another spell before any player can attempt to remove Omniscience with spells or abilities.
No other card is named in this ruling.
Legal formats
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