Uro and Cloudstone Curio

[Drusus]

If I have Cloudstone Curio out with a flash creature, then I cast Uro, Titan of Nature's Wrath, bouncing the flash creature back to my hand, could I then in response to his triggered ability for ETB w/o escpae by casting the bounced flash creature to then bounce Uro back to the hand?

[Argus]

Yes.

For the sake of definiteness, let's say the flash creature is Zealous Guardian. The sequence could then be something like this:

1. Your main phase begins.
2. You get priority and cast Uro, Titan of Nature's Wrath. You pay the cost using 1GU obtained in an unspecified way.
3. You get priority and pass.
4. Opponent gets priority and passes.
5. The top object on the stack (the spell cast in step 2) resolves. You put Uro onto the battlefield. This triggers its first two abilities and the ability of Cloudstone Curio.
6. You would get priority, but there are triggered abilities to put on the stack. You control all three, so you choose the order. A) You put "Whenever Uro enters the battlefield or attacks you gain 3 life and draw a card, then you may put a land card from your hand onto the battlefield." on the stack. B) You put "When Uro enters the battlefield, sacrifice it unless it escaped." on the stack. C) You put "Whenever a nonartifact permanent enters the battlefield under your control, you may return another permanent you control that shares a permanent type with it to its owner's hand." on the stack.
7. You get priority and pass.
8. Opponent gets priority and passes.
9. The top object on the stack (the ability put there in step 6C) resolves. You choose to return Zealous Guardian to your hand.
10. You get priority and cast Zealous Guardian. You pay the cost of {w/u} using U obtained in an unspecified way.
11. You get priority and pass.
12. Opponent gets priority and passes.
13. The top object on the stack (the spell cast in step 10) resolves. You put Zealous Guardian onto the battlefield. This triggers the ability of Cloudstone Curio.
14. You would get priority, but there is a triggered ability to put on the stack. You put "Whenever a nonartifact permanent enters the battlefield under your control, you may return another permanent you control that shares a permanent type with it to its owner's hand." on the stack.
15. You get priority and pass.
16. Opponent gets priority and passes.
17. The top object on the stack (the ability put there in step 14) resolves. You choose to return Uro to your hand.
18. You get priority and pass.
19. Opponent gets priority and passes.
20. The top object on the stack (the ability put there in step 6B) resolves. Uro is gone, so you can't sacrifice it.
21. You get priority and pass.
22. Opponent gets priority and passes.
23. The top object on the stack (the ability put there in step 6A) resolves. You gain 3 life and draw a card, then you may put a land card from your hand onto the battlefield.
24. You get priority and ....

[Drusus]

Thank you Argus.