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Like the spells from the Ravnica: City of Guilds block, they were not tied to one of the colors

Seeing as Master Duel somewhat follows the former's ban list, this is likely just Konami being cautious, but not wanting to completely stop the new cards from seeing play

Log in RULINGS 2017-08-25 The effect of Heralds Horn reduces only generic mana in a spells cost

This means that targeting a DARK Psychic opens your searches to Kozmo Dark Destroyer & Kozmo Dark Eclipser , and your LIGHT Psychics to Kozmo Sliprider & Kozmo Forerunner

Zoro works best in Red aggro strategies that want to pressure opponents through consistent leader attacks