This restriction helps you build interesting decks that aren't all 47 Lightning Bolts and a few mountains
What makes Mill good is that it approaches the game from such a different angle that it can often catch opponents off guard
When you look at my current roster, you can see: Henzie Bracket 4 High Power Reanimator Hofri Reanimator Bracket 3 Combo Win Cons Joshua, Phoenix Dominant Reanimator Bracket 2 Lower Velocity Aurelia, Law Above Bracket 2/3 Humans/Tokens Go Wide Isshin, Two Heavens as One Bracket 3 Dungeons & Burn Good Stuff Nahiri Bracket 3 Voltron/Equipment Sigarda High End Bracket 3 Voltron/Enchantress So, within those seven decks, you have similar themes or strategies, but with different flavors , and different heat levels
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You get a ramp spell early, which helps you get more mana, which helps you cast the more expensive half of the card from your graveyard
Ciel takes us through making a Commander Cube based off of Final Fantasy