As a four-mana aura, its good that you can technically use it in a fair way, slapping it onto something as a response opponents removing a different creature (or wiping the board)
If you do, you get to flip over cards from the top of your deck until you find a nonland card

Agrus Kos, Spirit of Justice Ajani Vengeant Ajani, Nacatl Avenger Akiri, Line-Slinger Alibou, Ancient Witness Alibou, Ancient Witness Anya, Merciless Angel Arcee, Acrobatic Coupe Arcee, Sharpshooter Aurelia's Fury Aurelia, Exemplar of Justice Aurelia, the Warleader Aurelia, the Warleader Bruse Tarl, Boorish Herder Catharsis Chance for Glory Cloud, Planet's Champion Comet, Stellar Pup Din of the Ancient Halls Eivor, Battle-Ready Excava, the Risen Past Explosive Getaway Feather, Radiant Arbiter Fight to the Death Gisela, Blade of Goldnight Hofri Ghostforge Huatli, Dinosaur Knight Huatli, Warrior Poet Iroas, God of Victory Kalemne, Disciple of Iroas Kassandra, Eagle Bearer Legion's Initiative Lightning, Army of One Lorehold, the Historian Nahiri, Forged in Fury Nahiri, Heir of the Ancients Nahiri, the Harbinger Nahiri, the Unforgiving Nelly Borca, Impulsive Accuser Neyali, Suns' Vanguard Osgir, the Reconstructor Otharri, Suns' Glory Outlaws' Merriment Phlage, Titan of Fire's Fury Photon, Living Light Quintorius Kand Quintorius, History Chaser Sami, Wildcat Captain Velomachus Lorehold Warleader's Call Waves of Aggression Winota, Joiner of Forces Wyleth, Soul of Steel

This complete Destined Rivals card list includes every card with rarity filters and live prices updated daily
This trigger fits incredibly well into aristocrat, Grixis, and Rakdos decks