Taniwha 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
Trample Phasing (This phases in or out before you untap during each of your untap steps. While it's phased out, it's treated as though it doesn't exist.) At the beginning of your upkeep, all lands you control phase out. (They phase in before you untap during your next untap step.)
Complete guide
Taniwha is a legendary blue Serpent that brings a massive body to the battlefield but at a high logistical cost. Mastering its phasing cycle is essential for any player looking to leverage its power without losing access to their resources. This guide breaks down the complex timing of its land-erasing ability.
Understanding Phasing
Taniwha has the Phasing keyword and a unique triggered ability that affects your lands. Phasing occurs automatically during your untap step before you untap your permanents. When a permanent phases out, it is treated as though it doesn't exist; it remains on the battlefield but cannot be targeted, sacrificed, or tapped for mana. It will phase back in during your next untap step.
The Upkeep Trigger
While Taniwha is on the battlefield, its ability triggers at the beginning of your upkeep, forcing all lands you control to phase out. These lands will not exist for the remainder of your turn, meaning you cannot use them for mana during your main phases or combat. They will only return to existence at the start of your next untap step, just before Taniwha itself phases out.
Strategic Timing
A common mistake is forgetting that you can tap your lands for mana in response to Taniwha's upkeep trigger. This mana will stay in your pool until the end of the upkeep phase. Additionally, because Taniwha itself phases out every other turn, you will have access to your lands normally on the turns Taniwha is missing from the battlefield.
Interaction examples
Solemn SimulacrumIf you play Solemn Simulacrum while Taniwha is phased in, you can search for a basic land and put it onto the battlefield. During your next upkeep, Taniwha's ability triggers. In response, you can tap all your lands, including the one found by the Golem, to add mana to your pool. Then, the lands phase out. You can spend that mana on spells during the upkeep, but once you move to your precombat main phase, that mana is lost and your lands are gone.
Roaming ThroneIf you control Roaming Throne and chose 'Serpent', Taniwha's upkeep ability triggers twice. However, once the first trigger resolves and all your lands phase out, the second trigger does nothing because there are no lands left to affect. This interaction doesn't change the phasing cycle, but it highlights that the lands are treated as non-existent until your next untap step.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Taniwha
Original English text — Wizards of the Coast / Scryfall
No additional ruling has been published for this card.
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Meta decks with Taniwha
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