As mentioned, it being an exile turns off so many strategies, and being able all of the most common permanent types, bar lands, means it's an emergency button that ultimately slows games back down to a crawl
Knowing How to Build a Commander Deck Means Having Plenty of Lands Lands play an import role in your deck
Bloodthirsty Conqueror Part of many an infinite combo, Bloodthirsty Conqueror is a five-mana (2B, 3C) 5/5 with Flying and Deathtouch who, whenever an opponent loses life, you gain that much life
Jund Turn 3: Play tapped Ravine, hold up Decay
It's a decently costed removal spell and one that can handle various kinds of permanents in a way that red is best at
You might also not want to pay four mana for your white planeswalker, and then Gideon of the Trials is looking a lot more appealing because of the discounted mana cost