Its perfect in Voltron decks because it adds double strike, and sometimes you just want to swing twice with your 10/10 lifelinking, double striking, flying commander
This third ability comes in handy in several Commander strategies (filtering cards by paying life is usually a very good deal), but of course Mystic Forge is most valuable in colorless or artifact-focused builds
Cast powerful spells, call upon classic summons, and even visit your favorite locations on the back of a chocobo
Sure, we should look at it more as a turn 4 mana rock, but hey, itll basically be the same as an extra land drop at that point, and thats okay
Moving it for only a single mana is really solid, and you really have something cooking if you can find a way to do this at instant speed