That's only card draw and this replaces itself and casts things for free each turn and thus impacts the battlefield and gives you uncounterable stuff too instead of drawing you cards and you save mana too so you can cast with discover and then save your mana for instants or tap out for two turns of mana usage from your main phase and this in one turn
I've built more than a few of these decks and because I rotate through my deck library so much, I have a hard time sticking with one of them for long enough to let the deck get there
Although it's at the bottom of this list today, clearly even the sky isnt the limit for this one
So, if youre in blue and run a bunch of these
Your only options for disposable enchantments are A Killer Among Us and a handful of cases
However, when its a creature, if it would deal combat damage to a creature, it instead makes it so that the owner has to shuffle that creature back into their library