but considering all this into account shadow clones should be a 10 chakra jutsu, NOT 20
very true madara but with shadow clones you can turn jutsu's into ultimates, which might be dangerous
turning jutsu's into ultimates varies on what jutsu you want to multiply. for example(fireball, rasengan, chidori, ect.) can be multiplied into a 40 chakra jutsu.
WITH shadow clones, i must add
in addition to shadow clones if you let them sit out for a turn. and your opponent tries to get rid of them, his/her jutsu will affect you as well. not just your shadow clones.