Block creature then remove from game
When the creature returns to the battlefield it has no memory of anything that happened earlier in the game. This means that it is no longer attacking, and thus is no longer being blocked by the defending player's creatures. This also means that it will neither deal nor receive combat damage, so neither it nor the defender's creatures will die.


  400.7. An object that moves from one zone to another becomes a new object with no memory of, or relation to, its previous existence. There are nine exceptions to this rule: [none of the exceptions apply to this case]