If I conquer emperors dais with last rites equipped to unit, I pay for emperors dais, and last rites a tide to base and target my unit at dais with tide ability. Can I return the tide to my hand for Dais trigger?

Yes — you can return the Tideturner for Emperor's Dais's trigger, but only if you order the Chain so Dais's trigger resolves last.

Put Emperor's Dais's trigger on the Chain first, then Last Rites's trigger (you control both, so you pick — Rule 383.3.d). Last Rites resolves first: it plays Tideturner to your base, and Tideturner's play trigger swaps it with the Last Rites unit at Dais (Tideturner → Dais, your unit → base). Then Dais's trigger resolves: you pay [1] and return the Tideturner — now "here" at Dais — to hand, then play the Sand Soldier token at Dais.

The key is that Dais's "pay [1] and return a unit you control here" is performed at resolution, not at finalization — it's "if you do" templating, not a cost-within-instructions (FAQ #3615; 2026-04-29 clarification). If you let Dais resolve before the swap happens, the Tideturner is still in your trash and you'd have to return a unit already at Dais instead.