user: Question: How many mystic arte have Hisui (Jadeite) Hearts 1 as the character?
Columns: ['Character', 'Game', 'Platform', 'Status', 'Mystic Arte', 'Character Voice']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Cless Alvein', 'Tales of Phantasia', 'Super Famicom', 'Playable', 'Stygian Blade 2', 'Takeshi Kusao']
SQL:

assistant: SELECT COUNT("Mystic Arte") FROM "Table" WHERE "Character" = 'Hisui (Jadeite) Hearts 1';