If you find a way to damage your opponent, either through combat damage or with a damage spell (such as [c]Lightning Bolt[/c]), you can play this spell for only one red mana, which is quite the bargain
Will the tricksters machinations bring woe or wonder
The "short" list looks something like this: Monsters Sphinxs Revelation Control Black Devotion Blue Devotion (now splashing white about half the time) R/W Burn Blitz Naya Hexproof White Aggro-Midrange "Dredge" With those in mind, lets look at the list of the cornerstone cards of those archetypes that can be Decayed Abruptly: Domri Rade
It's card advantage, guarantees two colors and then just puts in the work
At five cost, she is a bit slow, and cannot intrinsically protect herself save with her passive
Ureni is no slouch either