As you likely know, a lot goes into consideration as to what a Pokemon will be weak to when being ported, as a concept, from the video games (and the anime, manga, and so forth) to cardboard collectible format
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In these formats, players' collections don't matter - players are building decks from random cards
Oh sure, Magma Jet and Stormbreath Dragon go everywhere, but in general red can be used aggressively or more midrange/control
It's not easy with Commander's 100-card decks, but it's still possible, and there are quite a few Dimir cards that can get the job done
Its been something of a phenomenon