Magic: The Gathering

Six-y Beast [Unhinged]

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Title
Set: Unhinged
Type: Creature — Beast
Rarity: Uncommon
Cost: {3}{R}
As Six-y Beast enters the battlefield, you secretly put six or fewer +1/+1 counters on it, then an opponent guesses the number of counters. If that player guesses right, sacrifice Six-y Beast after it enters the battlefield.
Is it six?