This is a goofy deck idea to make a Maelstrom Wanderer deck as "fair" as possible: Every non-land card costs exactly seven mana.
It is still possible to cast Maelstrom Wanderer before turn 7; due to lands that make 2 mana, and battery lands.
There are some CMC 7 cards with morph, cycling, or landcycling; I put those in because it helps while you're waiting for 8 mana.
The deck plays a lot better than it looks; if one of your lands is a battery land or you have a couple of lands that make 2 mana, you'll be pretty quick to get Maelstrom out.
Click here for a text version of this decklist
Click here for my EDH Commander decks