Any spell on the stack that targets a creature you really dont want to lose can now be responded to with any of your instant or Flash spells
This blue backing was only present on the first print of the cards all other prints had a red backing
and allows you to play an instant or sorcery a second time
Its the kind of deck that has so many possible builds, you could easily go crazy trying to find them all yourself

Agent of the Iron Throne Akuta, Born of Ash Anrakyr the Traveller Aphemia, the Cacophony Ardyn, the Usurper Armix, Filigree Thrasher Arnim Zola, Bio-Fanatic Ashcoat of the Shadow Swarm Ashcoat of the Shadow Swarm Ashnod, Flesh Mechanist Balthor the Defiled Baron Helmut Zemo Baron Sengir Black Widow, Daring Operative Cabal Patriarch Chainer, Dementia Master Criminal Past Desmond Miles Drana, the Last Bloodchief Drivnod, Carnage Dominus Ebondeath, Dracolich Eddie Brock Egon, God of Death Eye of Nidhogg Fandaniel, Telophoroi Ascian Fang, Fearless l'Cie Geth, Lord of the Vault Geth, Thane of Contracts Gollum, Patient Plotter Gorex, the Tombshell Green Goblin, Back for More Grim Reaper's Scythe Grim Reaper, Lethal Legionnaire Grub, Storied Matriarch Haakon, Stromgald Scourge He Who Hungers Imotekh the Stormlord Iname, Death Aspect Ink-Eyes, Servant of Oni Interceptor, Shadow's Hound Isareth the Awakener Jacob Frye Junji, the Midnight Sky Kaervek, the Punisher Kalitas, Bloodchief of Ghet Keskit, the Flesh Sculptor Klaw, Sonic Subjugator Kokusho, the Evening Star Kothophed, Soul Hoarder Kroble, Envoy of the Bog Lich's Mastery Liliana, Death Mage Liliana, Death Wielder Liliana, Death's Majesty Liliana, Defiant Necromancer Liliana, Untouched by Death Liliana, Waker of the Dead Liliana, the Last Hope Liliana, the Necromancer Lim-Dl the Necromancer Lo and Li, Royal Advisors Lobelia Sackville-Baggins Lorcan, Warlock Collector Lord Skitter, Sewer King MACH-1, Swooping Scoundrel Madame Hydra, Reanimated Mastermind Plum Moira, Urborg Haunt Moonstone, Harsh Mistress Moseo, Vein's New Dean Necrodominance Nill, Vessel of Valgavoth

But new players should be delighted to learn about this card (if theyve somehow avoided ever seeing it until now)