Effect
When an opponent's monster declares an attack: Your opponent chooses 1 random card from your hand, then if it is a monster that can be Special Summoned, Special Summon it. Otherwise, send it to the GY.
Not an effect that targets.
You cannot activate "Hero Arrive" if you have 0 cards in your hand, or if you have no Monster Cards in your hand.
If the monster your opponent randomly chose is "Tsukuyomi" or a Special Summon Monster, and cannot be Special Summoned by the effect of "Hero Arrive", it cannot be Special Summoned, and that monster is sent to the GY.
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