Kyere, Sealbreaker

Flying Whenever Kyere, Sealbreaker deals combat damage to a player, exile that many cards from the top of that player's library face down. You may look at cards exiled this way.
Put Kyere, Sealbreaker on top of its owner's library: Turn all cards exiled with Kyere, Sealbreaker face up. Counter all spells with those names.