Hatchilng Feast with Maegi Crone, how many cards can I draw?

Each character that is reduced to 0 creates a different Response opportunity for Maegi Crone. In other words, you get to draw one card for each character whose STR is reduced to 0 by Hatchling's Feast.

This seems pretty straightforward. Did I miss something? Any reason you thought it might be otherwise?

I thought that per one effect I can play one response...

Rozy said:

No. You can play each Response only once per trigger. The trigger in this case is a character's STR being reduced to 0. If three different characters are reduced to 0, that's three different Response "windows". It's the same with Threat from the North, for example. If the revealing of the plot reduces X characters to 0, then you can trigger the Crone's Response X times (even while she herself is Moribund). The Draw Cap limits you there, obviously.

The "each response only once per trigger" rule prevents you from killing more than one character at a time with CS Robb, or from drawing more than one card with CS Sansa after an attachment is played on her. Of course you can play more than one different Responses to the same trigger, and you can play the same Response to different triggers more than once, as is the case here (if there's no limit imposed on the Responses, obviously).