Tainted Jacob

Whenever this creature attacks or blocks,
throw a coin. At head, this creature gains
+6/+6, flying, trample and indestructible. At tail, exile this creature and create a 1/1 colourless spirit creature token
with flying and "At the beginning of your
next turn, you may pay {b}{r}. If you do,
return Tainted Jacob from exile and sacrifice this creature".