if typeof(data.selected_card.one_time_effect) == TYPE_OBJECT:
pass
Iterate over array
# no index
for item in array:
pass
# with index
for i in range(array.size()):
var item = array[i]
Iterate over dictionary
# with keys
for key in dict:
var value = dict[key]
# or
for key in dict.keys():
var value = dict[key]
# no keys, only values
for value in dict.values():
pass