Pauper, for example, is a format where only commons are legal
This shields Stormbreath Dragon from staple white spells like Darksteel Mutation, Swords to Plowshares, Path to Exile, Generous Gift, and Anguished Unmaking
These are probably the stompiest of the stompy decks, so if youre looking for a deep-thinking game, you might want to look elsewhere
Im tempted to try adding Brain in a Jar to the maindeck, but you can only play so many spell enablers before you simply dont have enough spells in your deck to make all the enablers good, so its possible that Brain in a Jar should be a sideboard card to replace Jaces Sanctum against Dromokas Command decks, which currently occupy a huge portion of the field
If you really want to create a ton of Blood Tokens, look no further than Olivias Attendants