You, Magic Playtester [Unknown Event] Artifact Set: Secret Lair Showdown Type:

Set: Secret Lair Showdown Type: Instant Rarity: Rare Cost: {U} Counter target noncreature spell

Barrowgoyf's power is equal to the number of card types among cards in all graveyards and its toughness is equal to that number plus 1

The Magic Mirror crystallized it into much more

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You, Magic Playtester [Unknown Event] Artifact Set: Secret Lair Showdown Type:Set: Unknown Event Type: Legendary Creature Human Gamer Rarity: Mythic Cost: {1}{W} {T}: Choose target playtest card. Increase or decrease a number of your choice on it by one for as long as it remains on the stack or battlefield. {W}{U}{B}{R}{G}: Reveal the top 8 cards of your library. Put each playtest card among them into your hand, and the rest on the bottom of your library in a random order. Prize Card for the Unknown events at MagicCon Las