The purpose of the Gyrocopter is to scout. This effect is based on the Gyrocopter's "True Sight" passive ability which reveals invisible units, so there are no surprise attacks. Note that whilst the enemy Secrets are visible, they can still be triggered normally, but you can play around them easier. The anti-Stealth ability also applies to your own minions as well.
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Would you place a mulligan for against different decks?
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works extremely well