Omnath, Locus of All 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
If you would lose unspent mana, that mana becomes black instead. At the beginning of your first main phase, look at the top card of your library. You may reveal that card if it has three or more colored mana symbols in its mana cost. If you do, add three mana in any combination of its colors and put it into your hand. If you don't reveal it, put it into your hand.
Complete guide
Omnath, Locus of All represents the completion of the Elemental's journey, now infused with Phyrexian mana and a hunger for color. This legendary creature completely changes how you manage your resources by letting you store mana across turns and rewarding you for playing color-heavy spells. By mastering its unique mana-replacement effect, you can bank enormous amounts of power for your most expensive plays.
A Permanent Reservoir
Omnath's first ability is a replacement effect that prevents your mana pool from emptying as steps and phases end. Instead of losing unspent mana, it simply transforms into black mana. This persists across turns as long as Omnath remains on the battlefield. Note that if the original mana had specific restrictions, such as only being usable for artifacts, the resulting black mana keeps those exact same restrictions.
Resolving the Main Phase Trigger
At the start of your first main phase, you look at the top card of your library. You then check if it has three or more colored mana symbols in its cost. Hybrid symbols, Phyrexian symbols, and standard colored symbols all count toward this total. If it meets the criteria, you may reveal it to add three mana in any combination of the revealed card's colors and put it into your hand. If the card doesn't have enough symbols or you choose not to reveal it, you simply put it into your hand without adding mana.
Timing and Removal
The ability that adds mana is a triggered ability, not a mana ability, because it triggers at the start of a phase and requires a card reveal. This means your opponents can respond to the trigger before you see the card. Furthermore, if Omnath leaves the battlefield, the mana-saving effect stops immediately. You will lose any accumulated black mana at the end of the current step or phase unless you spend it before that transition occurs.
Interaction examples
Roaming ThroneIf you control Roaming Throne with 'Elemental' chosen as the type, Omnath's first main phase ability triggers twice. You will look at the top card, potentially reveal it for three mana, and put it in your hand. Then, you repeat the process for the new top card of your library. This allows you to draw two cards and potentially add a total of six mana.
Solemn SimulacrumImagine you have four green mana floating as your turn ends. Instead of disappearing, Omnath turns that mana into four black mana. On your opponent's turn, you can use that stored black mana to pay the generic cost for Solemn Simulacrum. Even though the mana changed color, it remains in your pool until spent or until Omnath leaves the battlefield.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Omnath, Locus of All
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
As long as Omnath, Locus of All remains under your control, you'll retain unspent mana as steps and phases end, although that mana will become black. This means you can add mana and spend it during a future step, phase, or turn. Once Omnath leaves your control, you'll have until the end of the current step or phase to spend the mana before it is lost.
No other card is named in this ruling.
- #2· Wizards of the Coast
If unspent mana you have has any restrictions or riders associated with it (for example, if it was produced by Omen Hawker), those restrictions or riders remain associated with that mana when it becomes black.
No other card is named in this ruling.
- #3· Wizards of the Coast
Omnath's last ability isn't a mana ability even though it can cause you to add mana. It uses the stack and can be responded to.
No other card is named in this ruling.
- #4· Wizards of the Coast
The mana symbols in the card you reveal may be in any combination of colors. For example, you could reveal a card with mana cost
, one with mana cost 
, one with mana cost 
, or one with mana cost 
.No other card is named in this ruling.
Legal formats
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