The deck is a White, Blue, and Green (or, Bant) deck that revolves around creatures that enter with +1/+1 counters, that synergise with Tidus, Yuna's Guardian's abilities
Akroma's Will Ancient Copper Dragon Atraxa, Grand Unifier Gix, Yawgmoth Praetor Kinnan, Bonder Prodigy Najeela, the Blade-Blossom Nyxbloom Ancient Purphoros, God of the Forge Ragavan, Nimble Pilferer Ranger-Captain of Eos Rhystic Study Thrasios, Triton Hero Urza, Lord High Artificer Vial Smasher the Fierce Yawgmoth, Thran Physician
However, there are also cards like Chip n Dale, Recovery Rangers
Your main line of play is to quest early with characters like Moana and Ariel, then use Rubys hard-hitting glimmers to challenge opponents and banish key threats