Commander
Legendary Creature — Serpent
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.)
Taniwha is a janky mono-blue commander built around its upkeep ability that phases out all your lands, then phases them back in untapped on your next untap step. You exploit this for free mana ramp, abuse enters-the-battlefield/leaves triggers on lands, dodge land destruction and stax, and use blue's tempo and control tools to grind out value before closing with a big evasive threat or a combo.
Lean into mana sinks and protection: add fast mana like Sol Ring and Mana Vault, payoffs such as Patron of the Moon and High Tide, and a tight combo finish (Thassa's Oracle plus draw outlets). Include ways to use lands at instant speed (Patron, Crucible-style recursion) so phasing isn't pure downside, and tutors like Mystical Tutor and Long-Term Plans to find your win line consistently.
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Played alongside this commander most often, across 5 MythicWyrm decks.
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Public decks brewed around this commander.
Same color identity (), by popularity.