If you want only one, $20 and pick up only
So far, no card portfolios have been announced
However, keeping a Rafiki, Mysterious Sage can help you make an early swing for board control on turn three
Kyoshi Warriors Invasion Reinforcements White Lotus Reinforcements Earth Kingdom Soldier Compassionate Healer Jet, Freedom Fighter Serpent's Pass The Cave of Two Lovers Tolls of War TierB- Bender's Waterskin Momo, Playful Pet Sokka, Lateral Strategist Gran-Gran Forecasting Fortune Teller Earth Kingdom Protectors Messenger Hawk The Mechanist, Aerial Artisan Agna Qel'a Deadly Precision Cat-Gator TierC+ Badgermole Knowledge Seeker Sold Out Kyoshi Battle Fan Firebending Lesson Airbender's Reversal Glider Kids Guru Pathik Boiling Rock Prison Kyoshi Village Misty Palms Oasis Watery Grasp Canyon Crawler Octopus Form TierC Jeong Jeong's Deserters Fire Nation Warship Merchant of Many Hats First-Time Flyer Pretending Poxbearers Toph, the Blind Bandit Enter the Avatar State Otter-Penguin Katara, Bending Prodigy It'll Quench Ya

Protect high-lore characters like Atitaya Fang General, Cri-Kee Lucky Cricket, or valuable characters like Mushu Your Worst Nightmare, as the Evasive this gives last until the start of your next turn aka for your opponents turn too
Blue-Red Big Noncreatures Cast massive spells for massive value with a blue-red deck