Like all Kaldheim gods, Birgi is a double-faced card, but the back face, Harnfel, Horn of Bounty, is hardly ever used
Support Codsworth, Handy Helper Puresteel Paladin Ardenn, Intrepid Archaeologist Stoneforge Mystic Halvar, God of Battle Pearl-Ear, Imperial Advisor Envoy of the Ancestors Loyal Inventor Stonehewer Giant Attackers Alela, Artful Provocateur Balan, Wandering Knight Kappa Cannoneer Support/attacker hybrids Armored Skyhunter Basim Ibn Ashaq Baleful Strix Ledger Shredder Raffine, Scheming Seer Starnheim Courser Danitha Capashen, Paragon Danitha, Benalias Hope Zur the Enchanter Equippable Creatures Batterskull Cloudsteel Kirin Razorfield Ripper Nettlecyst Glyph Elemental Eidolon of Countless Battles Power Boosts Arna Kennerd, Skycaptain thrives by powering up your Creatures, turning them into high-damage, well-protected, hard-to-block threats by creating additional copies of Equipment, Auras, and +1/+1 counters
My sideboard building is done in a very similar way to the deckbuilding itself
Flashback is certainly the most popular, but excluding the others would make the deck worse for very little gain
1 Seaside Citadel