The only downside to this amazing retrain is that it is only available in one set and in the highest rarity
SR Super Rare Centur-Ion Gargoyle II X DARK Level 8 [ DragonEffect ] ATK 2000 DEF 3000 You can send 1 face-up "Centur-Ion" card you control to the GY
So if you change 'Summoned Skull' to Level 3, and Summon it, it can attack even if 'Gravity Bind' is active
Do keep in mind however, that you cannot Summon from the Extra Deck as long as they remain on your field
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If the opponent's monster is in Defense Position and has fewer DEF than the attacking monster's ATK, it is destroyed, and its owner takes no battle damage, unless the attacking monster is able to inflict "piercing" battle damage