if i take a battlefeild with nidalee. which gives me card draw when i win combat. but i kill scuttle. who triggers first? does scuttle see the draw card?

According to the RiftJudge FAQ #10347, Scuttle Crab's Deathknell resolves completely before Nidalee, Cat Form's draw ability triggers.

The game processes combat outcomes and triggered abilities sequentially during the Combat Cleanup phase using the FEPR (Finalize, Execute, Pass, Resolve) process. They do not trigger simultaneously.

The Sequence of Events:

1. Combat Cleanup (Rule 461.1): Scuttle Crab takes lethal damage. Its Deathknell triggers as a "Pending Item."
2. First FEPR Window: Scuttle Crab's Deathknell is placed on the chain and resolves (your opponent reveals their hand).
3. Determine Combat Result (Rule 461.2-461.3): The game determines the winner of the combat. Since Nidalee survived and Scuttle Crab was defeated, you are declared the winner. This triggers Nidalee’s ability ("When I win a combat, draw 1") as a "Pending Item."
4. Second FEPR Window: Nidalee’s draw ability is placed on the chain and resolves, and you draw your card.

Does Scuttle see the draw?

No. Because the effects are processed in separate FEPR windows, Scuttle Crab's ability resolves before the game state even acknowledges that Nidalee has won the combat (which is what triggers the draw). Therefore, the card you draw from Nidalee is not in your hand when your opponent reveals their hand for the Scuttle Crab Deathknell.