What type of card is Letter Bomb?

Q: What type of card is Letter Bomb?

Letter Bomb is an Artifact. Its oracle text reads: "When this artifact enters, sign it and shuffle it into target player's library. That player reveals each card they draw until they draw this card. When that player draws this card, it deals 19½ damage to them."

Letter Bomb

Artifact

When this artifact enters, sign it and shuffle it into target player's library. That player reveals each card they draw until they draw this card. When that player draws this card, it deals 19½ damage to them.

Set Unhinged

Rarity Rare

Mana Value 6

Artist Daniel Gelon

Collector # 122

Scryfall Gatherer