Use the following links to get a random vintage legal creature from Magic: the Gathering with mana value X:

Mana Value(s):

1 - https://scryfall.com/random?q=mv%3D1+t%3Acreature+f%3Avintage (983 creatures)

2 - https://scryfall.com/random?q=mv%3D2+t%3Acreature+f%3Avintage (2527 creatures)

3 - https://scryfall.com/random?q=mv%3D3+t%3Acreature+f%3Avintage (3206 creatures)

4 - https://scryfall.com/random?q=mv%3D4+t%3Acreature+f%3Avintage (2887 creatures)

5 - https://scryfall.com/random?q=mv%3D5+t%3Acreature+f%3Avintage (1933 creatures)

6 - https://scryfall.com/random?q=mv%3D6+t%3Acreature+f%3Avintage (1056 creatures)

7 - https://scryfall.com/random?q=mv%3D7+t%3Acreature+f%3Avintage (496 creatures)

8 - https://scryfall.com/random?q=mv%3D8+t%3Acreature+f%3Avintage (167 creatures)

9 - https://scryfall.com/random?q=mv%3D9+t%3Acreature+f%3Avintage (54 creatures)

10 - https://scryfall.com/random?q=mv%3D10+t%3Acreature+f%3Avintage (25 creatures)

11 - https://scryfall.com/random?q=mv%3D11+t%3Acreature+f%3Avintage (10 creatures)

12 - https://scryfall.com/random?q=mv%3D12+t%3Acreature+f%3Avintage (8 creatures)

13 - https://scryfall.com/random?q=mv%3D13+t%3Acreature+f%3Avintage (1 creature)

14 - https://scryfall.com/random?q=mv%3D14+t%3Acreature+f%3Avintage (0 creatures)

15 - https://scryfall.com/random?q=mv%3D15+t%3Acreature+f%3Avintage (4 creatures)

16 - https://scryfall.com/random?q=mv%3D16+t%3Acreature+f%3Avintage (1 creature)