Final Fantasy I: Garland, Knight of Cornelia // Chaos, the Endless Garland is the very first boss you face in the original Final Fantasy title
It can protect valuable cards from black discard, and can combine with library shuffling effects to improve your draw (such as Thawing Glaciers, Flooded Strand, or Ramosian Sergeant)
Beyond the obvious bear typal builds, you can give it cascade with Imoti, Celebrant of Bounty, you can use it to keep your ferocious, formidable, and other power-matters abilities online, and you can discard it when you cast your Indominus Rex, Alpha to give it hexproof and trample
Faithless Looting 9 The best discard tool on offer by quite a significant margin
Brave Blade, does 230 damage, with the downside that Zacian can't attack during the next turn