Staggershock [Mystery Booster] Nightmare Salamander Beast and it loses defender

and it loses defender

Set: Fourth Edition Type: Artifact Rarity: Uncommon Cost: {4} {3}

Set: Ravnica Allegiance Guild Kit Type: Creature — Human Cleric Rarity: Uncommon Cost: {1}{W}{B} When Sin Collector enters the battlefield

Walls collapse and kill people all the time

Set: Commander 2014 Type: Creature — Human Monk Rarity: Rare Cost: {3}{W}{W} Vigilance

Staggershock [Mystery Booster] Nightmare Salamander Beast and it loses defenderSet: Mystery Booster Type: Instant Rarity: Uncommon Cost: {2}{R} Staggershock deals 2 damage to any target. Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)