It's very easy for players to just pay 2 life to attack you with a big creature or a couple of deadly ones, as life in Commander is a less valuable resource than mana as a whole
Mana Crypt Because Mana Crypt doesnt cost you anything to play, its basically just 2 more free mana, which is incredibly powerful, even if you only get to use it once
A one-mana Leyline Binding that also draws a card is a pretty wild card, and that's to say nothing of fueling the card disadvantage that pitch spells create by just drawing the card back immediately
Rather than a fast-paced aggro deck, this is a slightly slower, support-focused deck filled with characters of the same type
The Rule of Four : You can have no more than four copies of any unique card
Just make sure you bring some dice or lots of tokens for when it starts to get wildly out of control