We have write-ups on the best mono black card draw, blue card draw, green card draw, red card draw, and white card draw too
The choice is the players
Aven Mindcensor I love Death and Taxes strategies, and in some formats like Modern where fetch lands are prevalent, slamming an Aven Mindcensor when the land search ability is still on the stack is priceless
At the same time, the Hero deck required fewer lands, which meant that the Rat deck was more likely to get mana flooded (by virtue of needing to build with more lands in the deck)
Cheap cards that can destroy your opponents creatures are the best
Also draw as this comes into play and gives your creatures trample