While it stretches your Bench to hold up to eight Dark Pokemon and then Dread End is capable of doing 30 damage for each Dark in play, its no wonder this became a competitive card.
However, if it does have one or more targets, those targets will remain the same for the copy
I may be partial to blue Shinies as you can tell from this list, but this is a card so strong that when it first leaked, I held off on reporting as I thought it was too good to be true
Incapsula incident ID: 537000110078748828-72596105662628590
Its cheap and has a thing for noncreature spells, so I can see it in Jeskai combo decks that require using its abilities to generate card advantage
This means that if Pikachu is at full health and manages to get knocked out by a single hit by an opponent, Pikachu's health immediately jumps back up to 10 health points , allowing it to survive for another turn