Totentaz, Merging Musician

At the beginning of your end step if a rat you control has died this turn create two Rat creature tokens with "this creature can't block"
{1}{b}{b}{t} Sacrifice 2 Rat creatures you control: create a black 2/2 token named Relentless Rats with "Relentless Rats gets +1/+1 for each other creature on the battlefield named Relentless Rats."