mtg plastic card storage Bulk AOBOPLE Trading Card Storage Box,3200+

This isnt really what you want in a commander, and honestly, Im not sure Id put this Denethor in the 99 of many decks either

Some of the most unique deck identities come from a particular type of commander: planeswalkers

Multicolor decks like Karador, Ghost Chieftain have even more options

There are 29 spells in the deck that have X in their mana value, so hitting a few of those and getting the reduction out of the box is going to be mostly consistent

Combo Jinnie with cards like Old Gnawbone, and shell give you seven 3/1s instead of seven treasures

There are other situations where Mana Crypts downside can become worse