This great blue card almost always gives you a two-for-one or better and in those rare situations where you must triple Mana Leak, you still had a counterspell for a devastating threat
"Magic The Gathering: The Walking Dead's Negan Is Now A Magic Card"
Even in Standard, you can replicate this effect with Flicker of Fate or you can play Priest and then bounce or sacrifice cards like Prison Realm for value, knowing that the creature underneath will stay exiled permanently
Creatures (23) 4 Lightning Berserker 3 Zurgo Bellstriker 4 Dragon Whisperer 4 Abbot of Keral Keep 4 Falkenrath Gorger 4 Goldnight Castigator Lands (22) Spells (15) While we wont be casting all that many seven-point Burn from Withins with this list, it can be part of a simple, no-frills red aggro package
What makes Shroofus such a blast to build and play is that he turns anthems and pump spells into board presence with nearly unparalleled speed one-mana acceleration like Llanowar Elves or Elvish Mystic can have you attacking with Shroofus on turn 3 before most players have blockers and then every Saproling token that connects afterward only adds to the growing swarm
if the fake pack had similar contents as a real pack), but it could be a good start