C (gcc), 48 bytes

f(){printf("Min%sraft",rand()%10000?"ec":"ce");}

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Version closer to \$\frac{1}{10000}\$

For a pseudorandomness as close to \$\frac{1}{10000}\$ as possible:

C (gcc), 81 bytes

i;f(){long p=0,m=1e4;for(i=0;m/++i;)p+=rand();printf("Min%sraft",p%m?"ec":"ce");}

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C (gcc), 48 bytes

f(){printf("Min%sraft",rand()%10000?"ec":"ce");}

Try it online!

Version closer to \$\frac{1}{10000}\$

For a pseudorandomness as close to \$\frac{1}{10000}\$ as possible:

C (gcc), 79 bytes

f(){long p=0,m=1e4,i;for(i=m;i--;)p+=rand();printf("Min%sraft",p%m?"ec":"ce");}

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C (gcc), 48 bytes

f(){printf("Min%sraft",rand()%10000?"ec":"ce");}

Try it online!

C (gcc), 48 bytes

f(){printf("Min%sraft",rand()%10000?"ec":"ce");}

Try it online!

Version closer to \$\frac{1}{10000}\$

For a pseudorandomness as close to \$\frac{1}{10000}\$ as possible:

C (gcc), 81 bytes

i;f(){long p=0,m=1e4;for(i=0;m/++i;)p+=rand();printf("Min%sraft",p%m?"ec":"ce");}

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C (gcc), ⁴⁸ 49 bytes

Added a byte, in response to ericw31415's comment, to get the probability as close as possible to \$\frac{1}{10000}\$.

f(){printf("Min%sraft",rand()>214748?"ec":"ce");}

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C (gcc), 48 bytes

f(){printf("Min%sraft",rand()%10000?"ec":"ce");}

Try it online!