This effect is very valuable when you have something big on the field, like Loading
The best sweepers are ones that are easy to cast
His card stretches the definition of the "Mystic Arcanum" ability, which usually refers to a warlock spell of 6th level or higher
Hydreigon ex Special Illustration Rare, 169/086 The atmospheric artwork on this Hydreigon ex cards Special Illustration Rare variant is pretty cool, showcasing the three-headed, dragon-style Pokmon flying through a lightning storm
"Skill Drain" and "Mind Drain" can be used against any "Fabled"s with effects that respectively activate on the field or in the hand (i.e "Grimro" and "Nozoochee" in the Hand.) "Goblin of Greed" can also impede "Fabled"s because it will restrict them from being discarded as a cost, hence making it more laborious to use them.
Keep in mind that the ability triggers when an opponent loses an artifact too, making it a great anti-Treasure card