Milling random cards will give pseudo card quality or card advantage, or it can be a mana saving too
(Chuckle as your opponents try to cast Fog in 2019 when you have eight maindeck ways to incidentally counter it.) Bonecrusher Giant, Wild Slash, Lightning Strike, and Wizards Lightning offer a ton of reach for red aggro decks, and allow you to maintain pressure while cheaply removing opponents threats
The first is the Standard-release set D&D: Adventures in the Forgotten Realms
Rigo, Streetwise Mentor itself gives you a card, and its flexible enough that you can either focus on the attack triggers and saboteur effects (Delney, Streetwise Lookout and Enduring Curiosity, for example), or you can try to overwhelm your opponents with sheer numbers in a token build
Faithless Looting And for the best red piece of card draw in Magic, we have [c]Faithless Looting[/c]
#8 Staff of Eden, Vaults Key Staff of Eden, Vaults Key is deceptively powerful at least, in Commander