just screwing around with Character Creation again in Mutants and Masterminds. I'm just a little confused with how the Summon power functions, specifically its limits. I know that each attack and effect cannot exceed double the Power Level of the Campaign (combined if its an attack with an effect), Minions cannot exceed my Character's Power Level, each rank in Summon gives you a pool of 15exp to build the minion with, and you have the option to summon multiple copies of minions if you purchase the ability that way.
That being established,
How many ranks can I have in Summon per level, and would I be able to summon more minions if I sink less experience into each one?