See title, for example [[Generous Patron]]. It’s a long running question I had with a friend, and we kind of came to the conclusion that the answer is no because the creature doesn’t yet exist when the ETB resolves.
But I gave it some thought again because it feels so weird that so many cards have this kind of effect and supposedly it doesn’t get triggered. Does anyone have a definitive answer to this? Would be great if you can refer to the official rulings.
“Whenever a creature enters the battlefield” is just a more general version of “When ~ enters the battlefield”, so yes even in this case it’d trigger its own ETB. This is the relevant rule, which even calls out this case:
Cards are generally not worded this way to avoid confusion though. Instead you might see “Whenever ~ or another creature enters the battlefield”, for example with [[Thorn Mammoth]].
[[card name]] to call