Standing Tide is a legendary major card out of the New mechanic pool. Returning Wave stops at 7 u and stands as a 3 s wall, striking inside it every second, before returning at 100%; 60% damage.

You can take it once · it only turns up when your Special ability can actually use it · it can be offered for 0 of the 34 abilities.

Only one card can reshape that ability this way — this one, or Tidal Bore and Undertow Crest. Take one and the rest are gone for the run.