No. But if you want the dream to become a reality in a shorter amount of time, than yes, you need a plan.
For a dream to become a reality, no matter what it is, an action has to be taken. Even if you have big lotto dreams, you have to take the action of making or finding money or a sponsor. someone has to take the action of buying the ticket, picking the numbers (or deciding and taking action to let the machine do it) etc.
Now if you were to systematize the action steps you might have a higher chance of winning the big Lotto dream.
You will research the most winning numbers over the past 10 years,
You will play 5 cards every day. you will choose numbers in this fashion with a percentage of them being picked by the machine.
etc. vs each day randomly showing up and grabbing a ticket.