Theyre action at a cost, and you start getting into logjams where you cast your learn card, then cast the Lesson, then draw more learn cards in the process, and have more spells than you have mana to cast them
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I expect Invasion of Gobakhan to be a Standard staple in white aggro decks like Soldiers, Humans, and Knights and that it should have a chance to break into formats like Pioneer and Modern as well, both of which have tier white-weenie decks
Don't forget about Accursed Duneyard which offers regenerate for a select group of creature types and it makes absolute sense for skeletons to work with this group of undead
Just grab two packs and shuffle them together for wild combos and a unique gameplay experience thats great for a quick, casual game, for older players looking to jump back in, or for giving new players a fun, simple way to learn the game