There's also only one Slavörg, Akiro's Game, Hoodwink, Packmaster's Cowl... Basically 3 of each level 1, 2 of each level 2+, but only 1 of each Unique or Epic or "Mage Type only" (since you generally only have 1 of that in play / in your book at a time). Also, card counts are generally half what they would be in an Arena expansion - which makes sense since most card limits (in your spell book) are half what they are in Arena.