Question: what does defender mean in magic the gathering
[{'answer': "ca n't attack", 'provenance': [{'wikipedia_id': '17410459', 'title': 'List of Magic: The Gathering keywords', 'start_paragraph_id': 127, 'start_character': 180, 'end_paragraph_id': 127, 'end_character': 193, 'bleu_score': 1.0, 'section': 'Section::::Keywords from Expert-Level expansions (mechanics).:Detain.\n'}]}, {'provenance': [{'wikipedia_id': '17410459', 'title': 'List of Magic: The Gathering keywords', 'start_paragraph_id': 30, 'start_character': 0, 'end_paragraph_id': 30, 'end_character': 242, 'bleu_score': 0.5172663861217061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2373442273958543681}, 'section': 'Section::::Evergreen keywords.:Defender.\n'}]}]