Howling Mine (T1, Ext, S) If any one card in Magic is the poster-child for card drawing, it is Howling Mine
While the front side is good enough to see play on its own, the fact that it only has four defense counters makes it relatively easy to flip (a single Sheoldred, the Apocalypse attack gets the job done), and the backside offers a very powerful creature that can defeat a battle or kill a planeswalker each turn while potentially generating card advantage as well
Le grand retour des Decks Commander Final Fantasy La folie du Reprint MTG : Final Fantasy ne sarrte pas aux boosters
This Secret Lair is the pickup if you have a Zombie typal deck
If you're looking for another X spell, I might suggest Voracious Hydra - As it is cheapish $ wise, acts as removal and a creature or just a really big beater
Cast it at the end of an opponents turn and draw your pick immediately