I typically run Perplexing Test in token decks to disrupt my nontoken opponents, but just having an instant-speed board wipe can be valuable for decks that want to hold up mana each turn
Then you have the card's effect: in Gifts Ungiven, you search your own deck for cards, whereas in Gifts Given you search your opponent's deck for four cards
Its a tragically common defect in many players logic circuits that they cannot comprehend the notion that just because something has never happened before, it might still happen someday
Then, if you have 13 life at the beginning of your end step, you can pay six mana to transform Jerren into Ormendahl, the Corrupter
Agrus Kos, Eternal Soldier | Illustration by Victor Adame Minguez There are over 100 legendary spirits in Magic, and those are the spirit commanders
As MTG shifts towards decks that play more to the board in a tempo game, its common to see blue decks that rely on creature and permanent loops do well, using cards like Stormchaser's Talent and Quantum Riddler as blink targets and cards like Boomerang Basics as engines