Engines let you draw multiple cards over a longer period of time
96 points
If you've got early artifact mana and your opponent doesn't, chances are you'll win
Single-target pump spells are rarely seen in Commander outside of Poison decks, because their effect - helping a single creature win a single combat - is so small compared to the infinite combos, massive token armies, and other nonsense that the format is known for
The new equipment support cards will slot perfectly into my Captain America and Lara Croft decks, all the new non-creature synergies might convince me to rebuild my Veyran, Voice of Duality deck, and outside of constructed formats the breadth of mechanics and fantastic designs has me chomping at the bit for Draft and Sealed events
Glacierwood Siege I suspect many players will play Glacierwood Siege to get more Crucible of Worlds action going on, but this card can be a strong mill option as well