DM, Champion of the Squeak

Other Mice you control cost {2} less to cast. (This effect can't reduce the mana in that cost to less than
one mana.)
Mice you control get +1/+1 and have vigilance.
Whenever a nontoken mouse you control dies,
create a 1/1 red and white mouse creature token.
{ut}, {w}{r}: Create a 1/1 red and white mouse
creature token.