Because once its discarded to the graveyard, most decks will just leave it there
Do-Over As long as you have Do-Over in your hand and leave up 2 mana, you can play your turn exactly how you want, knowing youll get a second chance if things go wrong
Crow, Dimensional Fissure, Macro Cosmos, Shadow-Imprisoning Mirror and more can prevent Dark World from setting up, and once that happens at a crucial timing, it completely stops their momentum for upwards of several turns
(Until your next turn, that creature cant attack or block and its activated abilities cant be activated.) Chaos: Whenever you roll Chaos, put X +1/+1 counters on target creature you control, where X is equal to the number of cards in your hand
(KONAMI) releases the Legendary 5Ds Decks set for the Yu-Gi-Oh