Mim, Marvelously Mad

{b}: Until end of turn, Mim becomes a 1/1 black snake creature with deathtouch.
{g}: Until end of turn, Mim becomes a 2/2 green cat creature with hexproof.
{b}{g}: Until end of turn, Mim becomes a 3/3 black and green tiger creature with vigilance.
{b/g}{b/g}{b/g}: Until end of turn, Mim becomes a 4/4 black and green rhino creature with trample.
{b/g}{b/g}{b/g}{b/g}{b/g}: Until end of turn, Mim becomes a 6/6 black and green dragon creature with flying.