No chance is given to use the colorless mana from Su-Chi

[droopiersubletting]

When Su-Chi dies during combat, during the combat damage phase you are supposed to have a chance to use that colorless mana. (If you wait until end of combat, you have lost that chance)

Instead, what happens is Su-Chi dies, then it simply skips immediately to end of turn. (In the cases I tested, Su-Chi was my blocker, but it shouldn't matter if it's attacking or defending)

[Fregnor]

I playtested, and the game works fine if Su-Chi dies in your own Combat Phase. You get the mana and can spend it. But like you say, I could not find a way to set the opponent's phase stops so that you get the mana and can spend it if Su-Chi dies during your opponent's Combat Phase.

[friarsol]

There's a setting that will prompt you if you are attempting to pass with mana in your mana pool you can try. Otherwise, you need the first strike or regular combat damage steps toggled to green to stop during so you can spend the mana.