Once per turn, during your Main Phase 1, if you did not Summon/Set any monsters
The catch is, there are only twenty gates in all of Magic and seven of them arent legal in this deck
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These story elements play into the mechanics of this set
Skypalace Babylon trades away the ability to destroy any one targeted card and deal damage, instead gaining the ability to deal damage equal to half the ATK of monsters it destroys by battle and an effect that lets it attack a second time by detaching material (allowing it to potentially deal more damage at the cost of flexibility)
Sometimes, land destruction is referred to as Sinkhole or Stone Rain, because these were some of the original land destruction spells