If you really want to create a ton of Blood Tokens, look no further than Olivias Attendants
Very strong value
Blight Mamba Blight Mamba can easily regenerate using its activated ability if an opponent destroys it, so despite having no opposable thumbs, is great to wield equipment
In the early game, it puts you a turn ahead of everyone else, which, combined with mana rocks like Sol Ring, can let you run away with the game
Cards With Delve Delve rewards you for getting cards into your graveyard, and allows you to use cards that would just be sitting in your graveyard otherwise
On the other side, Karn, Scion of Urza, Lyra Dawnbringer, History of Benalia, Mox Amber, Settle the Wreckage, and Walking Ballista are all on their way down