You can use this card's summoning requirement to your advantage by combining it with "Release from Stone" to summon two monsters in one
After you Special Summon this card, use "Torrential Tribute". This combo will clear your opponent's side field, allowing you to attack with the monster from your Normal Summon (if you didn't Normal Summon before Summoning this card).
After this card has been summoned and is in the graveyard or banished, if you have a revival card set ("Call of the Haunted" or "Release from Stone"), if your opponent uses a card like "Breaker the Magical Warrior" you can chain the card to have all of their spells and traps destroyed.
Summon this card from your Graveyard during your opponent's End Phase with "Limit Reverse". Then change it to defense position during your next Main Phase - the second effect of "Limit Reverse" will trigger, destroying "Gigastone Omega" and all of your opponent's Spells and Traps along with it.
Summon this card and then play "Dark Fusion" and fuse this card with another Fiend-Type Monster to summon "Evil HERO Dark Gaia" and at the same time clear your opponent's back row cards.
Use this card in a deck that uses "King Tiger Wanghu" for an easy way to clear the opponent's back row.
Use this card in a Scrap Deck, where you can target it with the effect of "Scrap Dragon" or "Scrap Twin Dragon" for an instant "Harpie's Feather Duster" effect. You Special Summon this card by banishing a couple of EARTH monsters, and then destroy it with either "Scrap Dragon" or "Scrap Twin Dragon", gaining massive advantage!
Use "Assault on GHQ", "Destruct Potion" or "Generation Shift" on this card, as the destruction is part of the effect for each. And with "Generation Shift", you can summon the searched "Gigastone Omega" (providing you have enough EARTH monsters in the graveyard).