Question: how many different magic the gathering cards are there
[{'answer': 'thousands', 'provenance': [{'wikipedia_id': '18830', 'title': 'Magic: The Gathering', 'start_paragraph_id': 4, 'start_character': 369, 'end_paragraph_id': 4, 'end_character': 378, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18830', 'title': 'Magic: The Gathering', 'start_paragraph_id': 44, 'start_character': 0, 'end_paragraph_id': 44, 'end_character': 738, 'bleu_score': 0.984188478234951, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17829426773680943056}, 'section': 'Section::::Gameplay.:Deck construction.\n'}]}]