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Official text for Lorthos, the Tidemaker can be found using the Gatherer card database at Gatherer Enchantment Aura Enchant creature Enchanted creature has islandwalk and "Whenever this creature attacks, exile it and Meandered Towershell

That's why the Charizard is black, the Gyarados red and the Rayquaza grey-toned instead of green

Boon-Bringer Valkyrie is probably the best of the bunch on raw power level

Beyond that, as with all modal spells, versatility and freedom of choice are paramount, as this spell allows you to also wipe the board (of creatures with toughness up to 3, that is) or destroy multiple artifacts if they're causing you problems