Storm Colossus - Zeus
8
LIGHT
Thunder/Effect
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except by Tributing 1 face-up "Zaborg the Thunder Monarch" on your side of the field. When this card is successfully Special Summoned, you may destroy up to 3 monsters on your opponents side of the field. This card cannot attack during the same turn this card's effect was activated.
ATK/3000
DEF/1600
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Hailstone Colossus - Poseidon
8
WATER
Aqua/Effect
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except by Tributing 1 face-up "Mobius the Frost Monarch" on your side of the field. When this card is successfully Special Summoned, you may destroy up to 4 Spell or Trap cards on your opponents side of the field. This card cannot attack during the same turn this card's effect was activated.
ATK/3000
DEF/1600
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Inferno Colossus - Ares
8
FIRE
Pyro/Effect
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except by Tributing 1 face-up "Thestalos the Firestorm Monarch" on your side of the field. When this card is successfully Special Summoned, you may randomly discard up to 2 card(s) from your opponent's hand to the Graveyard. If any of the discarded card(s) were Monster Card(s), inflict damage to your opponent's Life Points equal to the sum of the monsters Levels x 200. This card cannot attack during the same turn this card's effect was activated.
ATK/3000
DEF/1600
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Nature Colossus - Demeter
8
EARTH
Rock/Effect
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except by Tributing 1 face-up "Granmarg the Rock Monarch" on your side of the field. When this card is successfully Special Summoned, you may destroy up to 3 face-down monsters on the field. This card cannot attack during the same turn this card's effect is used.
ATK/3000
DEF/1600
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Tempest Colossus - Hermes
8
WIND
Winged Beast/Effect
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except by Tributing 1 face-up "Riser the Wind Monarch" on your side of the field. When this card is successfully Special Summoned, return up to 3 cards on the field to the top of its owner’s Deck. This card cannot attack during the same turn this card's effect is used.
ATK/3000
DEF/1600
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cool cards. nice work. keep it up.

Nice. Balanced AND deadly. I especially like the names.