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.
Sure it does. The creature exists once it enters the battlefield. It goes on the field, then its ETB goes on the stack. If it’s countered, the ETB does not go on the stack. Therefore, its ETB is reliant on it existing on the field. Once that resolves, its secondary ability triggers if you put at least one of those counters on opponents’ creatures.