The rarity table for Gym Heroes is as follows: image881763 18.2 KB If you look at the individual rarities of the uncommons and commons, you will see a clear preference for Pokmon with two different variants as well as Trainer cards to be among the rarer ones
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You see, no one had any idea if Magic was going to succeed, but everyone was optimistic, so Richard asked various playtest team to design sets

Scientists Aang's Defense Aang, Master of Elements Aberrant Abeyance Abomination of Gudul Abundance Abundant Growth Abzan Banner Abzan Beastmaster Abzan Charm Academy Elite Academy Loremaster Academy Wall Academy at Tolaria West Accumulated Knowledge Aclazotz, Deepest Betrayal Acquisition Octopus Acrobatic Maneuver Action News Crew Adrestia Advancing the Spirit Adventure Awaits Adventurer's Airship Aeon Chronicler Aerial Extortionist Aesi, Tyrant of Gyre Strait Aether Channeler Aether Spellbomb Aether Syphon Aetherflux Conduit Afflict Afterlife Insurance Age of Ultron Agency Coroner Agent 13, Sharon Carter Agent Maria Hill Agent Venom Agent of Treachery Agent's Toolkit Aggressive Urge Agna Qel'a Agonasaur Rex Ahriman Air Nomad Legacy Airbending Lesson Airborne Aid Airship Crash Airship Engine Room Ajani Fells the Godsire Akroma's Blessing Akroma's Vengeance Aladdin's Lamp Alandra, Sky Dreamer Alaundo the Seer Alchemist's Apprentice Alchemist's Vial Alhammarret's Archive All-Fates Scroll All-Seeing Arbiter Alms Collector Alpharael, Dreaming Acolyte Alphinaud Leveilleur Alquist Proft, Master Sleuth Altanak, the Thrice-Called Altar of the Wretched Altar's Reap Amass the Components Ambition's Cost Ambling Stormshell

In her 2006 book Millennial Monsters , Anne Allison mentions the card suit and writes, within parentheses, that it "was eventually settled out of court"
(9/9/2022) Auras with mana value 3 or greater attached to an exiled permanent will be put into their owners' graveyards