That's way better if you already have legendary creatures on the battlefield, so try to play some legends alongside this Mardu dragon
More combat tricks for very low cost
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This dynamic effect leads to more interesting gameplay
Later in the game, you can spend mana to put the +1/+1 counters on creatures, which will, of course, be doubled
As with most things in Magic, however, I encourage you to do your own research on Gatherer or Scryfall as well there are a lot of blue mass removal spells beyond those in this post, and while they will generally be the best options for many blue Commander decks, some metagames and strategies can allow you to benefit a lot from a niche effect or specialized variation