SneakSneak is a keyword that represents a static ability that functions while the spell with sneak is on the stack. “Sneak [cost]” means “Any time you could cast an instant during your declare blockers step, you may cast this spell by paying [cost] and returning an unblocked creature you control to its owner’s hand rather than paying this spell’s mana cost.”
A permanent spell whose sneak cost was paid enters the battlefield tapped and attacking (see rule 506.3a). It will be attacking the same player, planeswalker, or battle as the creature that was returned to its owner’s hand to pay the sneak cost of the spell that became that permanent. (CR 702.190) (You may
castTo cast a spell is to take it from the zone it’s in (usually the hand), put it on the stack, and pay its costs, so that it will eventually resolve and have its effect. A player may cast a spell if they have priority. See rule 601, “Casting Spells.”
To cast a card is to cast it as a spell. (CR 701.5) this spell for
if you also return an unblocked attacker you control to hand during the declare blockers step.)
DestroyThe only ways a permanent can be destroyed are as a result of an effect that uses the word “destroy” or as a result of the state-based actions that check for lethal damage (see rule 704.5g) or damage from a source with deathtouch (see rule 704.5h). If a permanent is put into its owner’s graveyard for any other reason, it hasn’t been “destroyed.”
A regeneration effect replaces a destruction event. See rule 701.19, “Regenerate.” (CR 701.8) target creature or enchantment. If an enchantment was destroyed this way, you lose 2 life.