Hero's blade when does it

[Chuckdaman88]

When hero's blade is on the field and I cast so said "legendary creature" if I choose to attach it does the "creature" in question come into play attached or will this be a different trigger on the stack

[Kaylesh]

When hero's blade is on the field and I cast so said "legendary creature" if I choose to attach it does the "creature" in question come into play attached or will this be a different trigger on the stack

When a legendary creature enters the battlefield, {hero's blade}'s ability will trigger, allowing you to attach it to the legend.
This is after the creature has entered the battlefield, and your opponent has the oppurtunity to react to this trigger. If you cast {Zada, heron grinder} for example, your opponent can cast {lightning bolt} in reaction on the trigger, killing it before blade becomes attached.

[Chuckdaman88]

Though so thank you