The alternate commander here, Yuna, is very strong too and with a few tweaks to let you untap her multiple times per turn, she can turn this precon into quite a nasty combo deck
Once Costume Closet runs out of +1/+1 counters, it remains on the battlefield
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I dont think itll be that good, though
So while Counterspell might be able to deal with any threat, most times you'd be better off drafting Dark Banishing or Incinerate so you could drop early creatures, and then use the removal to mop up afterwards instead of having to wait for your gracious opponent to walk into your untapped Islands