It can be hard to project if and when collectibles like Pokmon or Yu-Gi-Oh
Likewise, Using it on a Lifelink creature will get you twice X life: once for the damage to itself, and once for the damage to the target
Endless Darkness will do 70 with 3 Darkness attached, an extra 20 if you leveled up from Darkrai (DP52) and have Cresselia on your bench, and if your opponent stays asleep between turns, add an extra 10 for each Darkrai G on your bench, (Yes, Darkrai G is Stackable!) So, 90 damage with an ideal set up, add 10 or 20 with Darkrai Gs on the bench, and Crobat G if you need the extra damage
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