Opening Ceremony This six-mana costing sorcery makes six mana so it fits into Storm brews
For Amonkhet, that card is Glorious End
The big downside here is the additional casting cost of returning a card from exile to an opponents graveyard
Enchanted cards are special, full art cards that are very rare
A low-curve multicolor aggro deck suffers by far the most for this downgrade, so this is where I would most recommend directing your dollars to the remaining copies of Blightstep Pathway and Haunted Ridge, and maybe some Hives of the Eye Tyrant
Sure, it may even be enough to take one player out, but then they have to face several other opponents and are sitting with an empty hand, limping along until they are either swatted down themselves or luck into another powerful spell