Nissa, Vastwood Seer (Mythic) It may seem pretty odd to be calling out the most expensive card in the set as my top underdog pick, but hear me out
Anchor to Reality Axgard Armory Bitterthorn, Nissa's Animus Captain America, Liberator Cirina Bargainspinner Cloud, Midgar Mercenary Deadeye Quartermaster Fighter Class Forging the Tyrite Sword Godo, Bandit Warlord Godo, Bandit Warlord Honored Knight-Captain Kassandra, Eagle Bearer Kellan, the Fae-Blooded Kellan, the Fae-Blooded Kodama of the West Tree Nazahn, Revered Bladesmith Open the Armory Quest for the Holy Relic Raven Clan War-Axe Relic Seeker Runed Crown Steelshaper Apprentice Steelshaper's Gift Stoneforge Mystic Stonehewer Giant Strata Scythe Sun-Spider, Nimble Webber Sunforger Taj-Nar Swordsmith
In addition to serving as a foil for its enemies, each color can also serve as a bridge connecting its two allies
A mint condition Base Set Pikachu (not 1st edition or PSA-graded, mind you) costs less than the retail price of a modern booster pack