Is it possible to assign damage to a single blocking creature that is less than the attacking creature's power? If so, it is possible to assign less than lethal damage?
Suppose I attack with a big 20/20 creature, and my opponent blocks with Saber Ants (Whenever Saber Ants is dealt damage, you may put that many 1/1 green Insect creature tokens onto the battlefield). I don't want to give him 20 tokens, so can I just assign 3 damage and not the rest? Maybe I want to keep his Ants alive for some reason - can I assign less than lethal damage?