It can generate barriers to prevent all attacks
I could be wrong about that, but usually a deck that focuses down on one or two things will do better than precons, which famously suffer from something akin to multiple personality disorder

Shanna Lifegain Shanna, Purifying Blade | Illustration by Jody Clark Commander (1) Creatures (28) Avacyn's Pilgrim Cat Collector Elvish Mystic Essence Warden Giant Killer Llanowar Elves Soul Warden Soul's Attendant Kwain, Itinerant Meddler Selfless Spirit Senate Guildmage Angel of Vitality Augury Adept Daxos of Meletis Knight of Autumn Reclamation Sage Selvala, Explorer Returned Exemplar of Light Horizon Chimera Lathiel, the Bounteous Dawn Loxodon Hierarch Blossoming Bogbeast Cloudblazer Tatyova, Benthic Druid Azor, the Lawbringer Dream Trawler Nykthos Paragon Drogskol Reaver Instants (10) March of Otherworldly Light March of Swirling Mist Path to Exile Slip Out the Back Swords to Plowshares Tamiyo's Safekeeping Counterspell Delay March of the Multitudes Sphinx's Revelation Sorceries (7) Farseek Nature's Lore Rampant Growth Bala Ged Recovery Cultivate Kodama's Reach Sevinne's Reclamation Enchantments (9) Cleric Class Dawn of Hope Griffin Aerie Abiding Grace Gourmand's Talent Sigarda's Splendor Elspeth Conquers Death Glorious Sunrise Primeval Bounty Artifacts (9) Sol Ring Arcane Signet Azor's Gateway Azorius Signet Pristine Talisman Selesnya Signet Simic Signet Midnight Clock Well of Lost Dreams Lands (36) Adarkar Wastes Ash Barrens Bant Panorama Brokers Hideout Brushland Canopy Vista Celestial Colonnade Command Tower Deserted Beach Dreamroot Cascade Forest x4 Irrigated Farmland Island x2 Overgrown Farmland Plains x8 Prairie Stream Radiant Grove Scattered Groves Seaside Citadel Tangled Islet Temple of Enlightenment Temple of Mystery Temple of Plenty Tranquil Landscape Yavimaya Coast How can your opponents win if they never get your life to zero

Minun #194 Pokemon Paradox Rift Keep track of your collection value over time
Once things are underway, it's fairly easy to combo off - using your first fusion monsters to bring out even stronger nightmares