6 "Duelist Alliance" Introduced Three Meta Warping Archetypes Most Powerful Card: El Shaddoll Winda Before Deck Build packs were created, a booster pack rarely introduced multiple meta-relevant archetypes, as it was often difficult to fit many powerful cards for an archetype when the set also had to have generic cards in it
Jokulhaups Jokulhaups takes Devastation, then also destroys artifacts and prevents regeneration all around
If all else fails, you can always use Meticulous Excavation to bounce them back to your hand for a second try
Marvel, Kamala Khan Neach, Pinnacle Pariah Necrodominance Nerd Rage Nezahal, Primal Tide Niv-Mizzet, Visionary Null Profusion Nyssa of Traken Obeka, Brute Chronologist Power Without Equal Praetor's Counsel Price of Knowledge Proft's Eidetic Memory Recycle Reed Richards, Smartest Man Reliquary Tower Roaring Furnace // Steaming Sauna Roaring Furnace // Steaming Sauna Sea Gate Restoration Spellbook Spirit Water Revival Stairs to Infinity Sundial of the Infinite Tamiyo, Seasoned Scholar Tamiyo, the Moon Sage The Drum, Mining Facility The Great Synthesis The Lux Foundation Library The Magic Mirror The Second Doctor The Ten Rings Thought Devourer Thought Eater Thought Nibbler Thought Vessel Time Stop Tishana, Voice of Thunder Triskaidekaphile Trusted Advisor Twenty-Toed Toad Ultima Undercity Reaches
Legality depends on the tournament format -- Seize the Initiative can be legal in some formats and banned or restricted in others