Bass

If white mana wasn't spent to cast Bass, when it
enters the battlefield create a Dark Shadow token.
If black mana was spent to cast Bass, put three
+1/+1 counters on Dark Shadow and it gets
"Other Creatures you control that aren't
named Bass get -2/-2".
While Dark Shadow is on the battlefield
all combat damage that would be delt to Bass is
done to Dark Shadow instead.
{3}{b}{b} Create a Dark Shadow creature Token.