Legendary Enchantment Creature — God

Thassa, Deep-Dwelling

Mana value4EDHREC#1,236

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The Commander

Indestructible

As long as your devotion to blue is less than five, Thassa isn't a creature.

At the beginning of your end step, exile up to one other target creature you control, then return that card to the battlefield under your control.

{3} {U} : Tap another target creature.

Guide

Gameplan

Build a value engine around Thassa's end-step blink, flickering creatures with strong enter-the-battlefield (ETB) abilities every turn to grind out card advantage, board control, and incremental damage. Tap down blockers or attackers with her activated ability while staying resilient thanks to indestructibility. Slowly bury opponents in two-for-ones until an overwhelming board or a combo finishes them.

Strengths

Repeatable, untargetable-by-removal blink engine on a hard-to-kill indestructible body
Mono-blue gives access to the best counterspells, card draw, and tutors
Tap ability doubles as evasion enabler and a pseudo-removal/Fog effect
Flicker resets and dodges sorcery-speed removal targeting your creatures
Low mana value (4) makes recasting after a wipe cheap

Weaknesses

Slow and grindy; can be outpaced by aggressive or combo decks
Mono-blue struggles with enchantment and resilient permanent removal
Devotion requirement means Thassa is often a non-creature wall early
Heavy reliance on ETB creatures—dead-ish without good targets
Blink only hits one creature per turn, limiting explosive value

Key Cards

Palinchron — Untaps lands when it enters, and Thassa's blink makes it an infinite mana engine with enough untapped lands.
Peregrine Drake — Cheaper Palinchron-style untapper that goes infinite with Thassa plus any free flicker outlet.
Snapcaster Mage — Repeatable flashback every end step turns your graveyard into a recurring spellbook.
Mulldrifter — Draws two cards every single turn when blinked, a clean value baseline.
Archaeomancer — Returns an instant or sorcery each end step, enabling counterspell or bounce loops.
Sakashima of a Thousand Faces — Copies your best ETB creature and survives as a second blink target.

Upgrade Path

Add fast mana (Sol Ring, Mana Crystals, Mana Vault) and a tight counterspell suite to protect your engine and accelerate into Thassa. Lean into a compact infinite combo like Palinchron/Peregrine Drake with extra free flicker outlets (Eldrazi Displacer, Deadeye Navigator) so you don't rely solely on her once-per-turn blink, and include a payoff such as a Walking Ballista or aristocrat drain. Round out with strong tutors (Mystical Tutor, Fabricate) and resilient card advantage to make the value plan inevitable.

Core Cards

The most-played cards for this commander, built from aggregated deck data (the Mythic Graph). Build public decks to seed it.

Win Conditions

▸Infinite mana from untapper creatures fueling an X-spell or infinite ETB drain
▸Grinding overwhelming card advantage then closing with a big finisher like Blue Sun's Zenith
▸Repeated ETB pingers (Spark Double + drainers) draining all opponents
▸Beating down with Thassa plus evasive/tapped-out boards once devotion turns her on

Archetypes

Blink — Her end-step flicker is a built-in, recurring ETB-value engine.
Control — Mono-blue counters and her tap ability let you police the board while grinding value.
Combo — Untap creatures like Palinchron or Peregrine Drake plus a flicker outlet generate infinite mana.
Tempo — Tapping down blockers and flickering evasive threats pressures opponents incrementally.