In Modern, apart from spawning a new type of deck, the most likely home seems to be some sort of combo deck where Glorious End can buy one extra turn to set up the combo and win the game
If heads, your opponent's Active Pokemon is now Paralyzed
Sephiroth, One-Winged Angel is the whole reason I can put Sephiroth on this list and the transform condition is surprisingly easy to pull off
In all cases, you get an under-costed creature with a tug-of-war attached
[card]Preordain[/card] is banned
8 CARD VIEW P-098 | P | CHARACTER Buggy Attribute Slash Block icon 3 Type The Four Emperors/Cross Guild Effect [Blocker] (After your opponent declares an attack, you may rest this card to make it the new target of the attack.) [On Play] If you do not have 5 Characters with a cost of 5 or more, place this Character at the bottom of the owner's deck