That swing can stabilize a losing position and flip momentum, which is why Iono remains one of the most powerful tools in the current meta
I can definitely understand people not putting Yawgmoth, Thran Physician in their top five list as its only played in one deck, which isnt a dominant player in the metagame either, but the card makes the archetype and there arent too many good mono-black creatures in Modern right now
It comes in a few different variations due to Wizards of the Coast making minor changes in production
Despite Brainstorm's versatility, and its importance to the Legacy format, its power is diminished in the pauper format
While Goldspan Dragon is in play, treasure tokens you control generate two mana of any color instead of one
Maybe you could make the separate digital pads on the right rear paw