Here is my advice. Don't play ranked matches if you are not a grand master!
Because Grand Masters are the best rank and when you are playing ranked matches, you can't choise the opponent level so if you are level one and your opponent are level 50 you will die one shot:( so is more safe to go to ranked matches if you are on the maximum level.
Waiting until you are a grandmaster to fight in the arena only increases your chance of fighting wizards who have reached the max level as well. These matches are even tougher because those who have reached that level now have access to all the power of their specific school.
But it is much more challenging for a number of reasons other than the one above:
The amount of pips you have, the amount of fizzles you have to push through, the order in which your spells appear, and the way in which you make use of your school and construct your deck all play a large part in determining who will come out of the match victorious.
You are at the mercy of the spells in your hand and what you have to work with will be a big factor in who will control the fight.
How many times you fizzle, how many pips you have, and what spells you choose to use all work together. If you can figure out the formula of your school and trust in it, and use it to the best of your abilities, you can enter the arena with a confident hand, but know that you are still playing with factors you cannot fully control. These factors are the fizzling, the power pips and the order of your spells appearance during each round.
These factors are far more important than the simple level of your wizard.