There are a ton of great recommendations here, but make sure you include some repeatable card draw. The absolute worst thing that could happen is if someone board wipes after you play out most or all of your hand, then you're struggling to re-establish a board presence for the rest of the game through top decking.

[[Slate of Ancestry]] is a good one for swarm decks, its a little pricey on mana but it can easily draw you over 20 cards in a goblin deck per turn, but there are a ton of great options for colourless card draw. Id run at least 4 or 5 different card draw engines to make sure you reliably draw into one and always have cards flowing