(You can play a land this way only if you have an available land play remaining.) You may look at the top card of your library any time
Most decks win with creatures
As everyone knows, in the decks that made best use of the five Moxen blue was always the most sought after color due to cards like Time Walk and Ancestral Recall, so the Sapphire wins easily
Seriously, though, to the extent that product fatigue is real, I hear about it most clearly from Magic boomers who speak wistfully of the days when they knew all the cards, which of course makes Commander easier to play
Duelists Heritage, in addition to making your own attacks more potent, provides a pathway for political leverage on opposing turns with any creature which really wants to hit players
This is done by MTG designers to show that the color is corporatist and selfish, and black is one of the colors where these definitions best apply