Etrata, the Silencer [Guilds of Ravnica Prerelease Promos] 67 You must also Tribute monsters

You must also Tribute monsters from the field or your hand whose total Levels equals the Level of the Ritual Monster you Ritual Summon

and they are quick enough to snatch prey just as it blinks in or out of time

Set: Odyssey Type: Enchantment Rarity: Rare Cost: {2}{W} Whenever a spell or ability an opponent controls destroys a noncreature permanent you control

Set: EX: Trainer Kit 2 - Minun Type: Fire Rarity: Promo

Etrata, the Silencer [Guilds of Ravnica Prerelease Promos] 67 You must also Tribute monstersSet: Guilds of Ravnica Prerelease Promos Type: Legendary Creature Vampire Assassin Rarity: Rare Cost: {2}{U}{B} Etrata, the Silencer can't be blocked. Whenever Etrata deals combat damage to a player, exile target creature that player controls and put a hit counter on that card. That player loses the game if they own three or more exiled cards with hit counters on them. Etrata's owner shuffles Etrata into their library.