Dargo, the Shipwrecker + Su-Chi

[3drinks]

Dargo, the Shipwrecker
Su-Chi

Am I correct in assuming I can pitch Su-Chi to Dargo and use it's cccc to help cast the giant, yes? Or does the resolution of the ability happen once I am done casting Dargo?

Similar scenario in utilization of Myr Moonvessel and/or Cathodion.

Thanks.

[Argus]

Dargo, the Shipwrecker
Su-Chi

Am I correct in assuming I can pitch Su-Chi to Dargo and use it's cccc to help cast the giant, yes?

No. That ability won't go on the stack (let alone resolve) until the next time someone would get priority after you finish casting the spell.

603.2. Whenever a game event or game state matches a triggered ability's trigger event, that ability
automatically triggers. The ability doesn't do anything at this point.

603.3. Once an ability has triggered, its controller puts it on the stack as an object that's not a card the
next time a player would receive priority. See rule 117, "Timing and Priority." The ability becomes
the topmost object on the stack. It has the text of the ability that created it, and no other
characteristics. It remains on the stack until it's countered, it resolves, a rule causes it to be removed
from the stack, or an effect moves it elsewhere.

[3drinks]

I had a feeling thats how it would work out. Thanks for the clarification!