Six-y Beast

Creature - Beast 0/0, 3R (4)
As Six-y Beast comes into play, 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.¹
Is it six?
Illus. Anson Maddocks

Format Legality	Banned in Vintage, Legacy, Extended, Standard
Printings (1/1)	Unhinged (Uncommon)