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The Indomitable might be the exception given that you can cast it from your graveyard with enough tapped vehicles or pirates, so you can cheat commander tax unless an opponent exiles it

Most instants and sorceries are balanced with the understanding that they likely will just be cast a single time, so being able to cast them multiple times will make them much stronger

On top of that, UR likes spells, and this kind of instant that replaces itself always gets a boost there

Auriok Salvagers is another card like Salvaging Station that is trying to do what Teshar already does better

Dragonborn Champion is fine for helping you draw cards, but you need a way to reliably deal at least five damage to a player (probably with another dragon with flying)