I kinda used something like this:
for i in range(contain_elements.size()):
i = elements[0]
if contain_elements.count(i) < 3:
var ignis = preload("res://Entities/Player/Scenes/THREE/Ignis.tscn").instance()
self.get_node("Elements").add_child(ignis)
ignis.transform = get_parent().global_transform
but I'll try yours next...