Aang, the Last Airbender Abigale, Eloquent First-Year Aclazotz, Deepest Betrayal Adult Gold Dragon Aerial Responder Aetherborn Marauder Aethersphere Harvester Akroma's Will Akroma's Will Akroma, Vision of Ixidor Alela, Artful Provocateur Angel of Indemnity Angel of Invention Angel of Unity Angelic Skirmisher Animus of Predation Archangel Elspeth Archangel of Thune Archangel of Thune Archangel of Wrath Archfiend's Vessel Archon of Sun's Grace Archon's Glory Arctic Aven Arna Kennerd, Skycaptain Assassin Initiate Atraxa's Skitterfang Atraxa, Grand Unifier Atraxa, Grand Unifier Atraxa, Praetors' Voice Aurelia's Vindicator Baneslayer Angel Baneslayer Aspirant (playtest) Barrow Naughty Battlegrace Angel Betor, Ancestor's Voice Bleeding Effect Blessed Defiance Blood Baron of Vizkopa Bonepicker Skirge Boon-Bringer Valkyrie Bre of Clan Stoutarm Breathless Knight Brisela, Voice of Nightmares Butcher of the Horde Cairn Wanderer Captain Marvel, Earth's Protector Celebr-8000 Celestine, the Living Saint Champions of Tyr Chancellor of the Dross Chromanticore Congregation Gryff Cosmic Spider-Man Crystalline Giant Daggerdrome Imp Dawnbringer Charioteers Deep-Cavern Bat Divinity of Pride Donald Blake, Guise of Thor Dragonbroods' Relic Dragonlord Dromoka Dream Trawler Drogskol Reaver Dust Animus Eater of Virtue Eirdu, Carrier of Dawn Elenda and Azor Elenda's Hierophant Elgaud Inquisitor Elspeth Resplendent Enter the Avatar State

Each pairing brings unique strengths, weaknesses, and playstyles to the table
It's worth it for the recursion and then ramping too so it's two for one for very cheap
The idea here is that the card pool is designed to build decks in a more puzzle-like style, meaning that they usually rely more on synergy and not raw power level