Note: Neutral cards form the basis for draft appearance rates.
On average, Arena runs consist of 60% Common, 28% Rare, 10% Epic, and about 2% Legendary cards.
Class minions are +100% more common than neutral cards.
Class Spells and Weapons are +175% more common than neutral cards.
Journey to Un'Goro cards receive an additional +50% increase in their appearance rate.
The following cards are unavailable in arena
Jungle Giants, The Marsh Queen, Open the Waygate, The Last Kaleidosaur, Awaken the Makers, The Caverns Below, Unite the Murlocs, Lakkari Sacrifice, Fire Plume’s Heart, Klaxxi Amber Weaver, Dark Arakkoa, Cult Sorcerer, Hooded Acolyte, Twilight Darkmender, Blade of C’Thun, Usher of Souls, Ancient Shieldbearer, Twilight Geomancer, Disciple of C’Thun, Twilight Elder, C’Thun’s Chosen, Crazed Worshipper, Skeram Cultist, Twin Emperor Vek’lor, Doomcaller, C’Thun, Dust Devil, Totemic Might, Ancestral Healing, Windspeaker, Sacrificial Pact, Sense Demons, Void Crusher, Succubus, Savagery, Soul of the Forest, Mark of Nature, Warsong Commander, Rampage, Starving Buzzard, Timber Wolf, Snipe, Mind Blast, Lightwell, Purify and Inner Fire.
Flamestrike, Abyssal Enforcer, and Vicious Fledgling will appear in drafts 50% less often.
Popular cards had small drop rate changes to address class balance concerns. (Note - These changes range from 1-5%. They are small enough that they are unlikely to be noticed during an individual draft, but should have enough cumulative impact to help improve class balance.)
We’re working to improve the Arena experience, and your feedback is always appreciated!