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#2 Some of these translations are silly

Regular Gyarados

SR Super Rare Santa Claws X LIGHT Level 6 [ FiendEffect ] ATK 1200 DEF 2500 You can Special Summon this card (from your hand) to your opponent's field in Defense Position, by Tributing 1 monster they control

Passimian can be obtained from Extradimensional Crisis pack in the Extradimensional Crisis set

Youd use Magical Scientist to special summon a whole bunch of fusion monsters from your extra deck, the immediately tribute them off with Catapult Turtle for a whole bunch of damage

If Gluttonous Hellkite is countered or otherwise leaves the stack in response to that triggered ability, the triggered ability will still resolve as normal