As Shapeshifter enters, choose a number between 0 and 7.
At the beginning of your upkeep, you may choose a number between 0 and 7.
Shapeshifter's power is equal to the last chosen number and its toughness is equal to 7 minus that number.
The *s below represent any number from 0 to 6. You set * when Shapeshifter is cast, and you may change it during your upkeep.
Born like a Phoenix from the Flame, But neither Bulk nor Shape the same.
—Jonathan Swift, "Vanbrug's House"