Is Emperor's Dais bounce mandatory once the trigger is finalized?
If I finalize Emperor's Dais by targeting a unit, is bounce optional?

When you conquer here, you may pay and return a unit you control here to its owner's hand. If you do, play a 2
Sand Soldier unit token here.
Artist: Kudos Productions
Card Set: Spiritforged
If I finalize Emperor's Dais by targeting a unit, is bounce optional?
I control Emperor's Dias with one unit. Opponent responds to Dias with Rengar while my unit bounces. Am I still in control when Rengar enters, or do I lose control before the staged showdown opens?
If two units trigger conquer effects and one effect asks you to choose whether to put a pay-and-bounce trigger on the chain, can you decide one target first and then switch to the other unit later between those triggers?
When you conquer with Emperor Dais and choose to bounce a unit back without paying for the Sand Soldier token, does the trigger fail to finalize with no reaction window, or does it still go on the chain and remain reactable? Does Emperor Dais's conquer trigger finalize if you decline the sand soldier?
Rules quiz Q1: Wawa has floating energy when Emperor's Dais conquer trigger resolves. Can she bounce a unit without paying 1 and creating a Sand Soldier? Q2: Hostile Takeover controls Draven in combat; he dies with Svellsongur. Who scores?