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1 Curse of Opulence

If your opponent attacked with two 3/3's, he would both be dead

Imagine running this in a Muldrotha deck, where you can potentially cast both sides in the same turn cycle

Scout Plane" #1410 #5823 "Berserk Gorilla" #1411 #5824 "Freed the Brave Wanderer" #1412 #5826 "Witch Doctor of Chaos" #1413 #5827 "Chaos Necromancer" #1414 #5828 "Chaosrider Gustaph" #1415 #5829 "Inferno" #1416 #5830 "Fenrir" #1417 #5831 "Gigantes" #1418 #5832 "Silpheed" #1419 #5833 "Chaos Sorcerer" #1420 #5834 "Gren Maju Da Eiza" #1421 #5835 "Black Luster Soldier - Envoy of the Beginning" #1422 #5836 "Fuhma Shuriken" #1423 #5837 "Heart of the Underdog" #1424 #5838 "Wild Nature's Release" #1425 #5839 "Ojama Delta Hurricane!!" #1426 #5840 "Stumbling" #1427 #5841 "Chaos End" #1428 #5842 "Chaos Greed" #1429 #5844 "D

(1) When this card is added from the Deck to your hand, or your monster is destroyed by battle: You can reveal this card in your hand

Considering they can stack damage-boosters like Strong Energy, Diancie Prism Star, Choice Band, and Beast Energy almost seems a bit unfair, especially when they use a bunch of them on the first turn of the game to swing for over 100 damage