The biggest reason is that the other cards ahead of it have even less of an opportunity cost than Mana Crypt
I have a lot of experience playing group hug in EDH, and I can say with confidence that no matter how friendly your deck is, some players will feel manipulated by this type of strategy and retaliate accordingly
2007 Sets : Planar Chaos , Future Sight , and Lorwyn My Pick : Mirror Entity ( Lorwyn ) The year 2007 brought the next big return to typal themes with the Lorwyn block
I am aiming for a big battlecruiser style of play so Double Vision, and Thousand-Year Storm fit the bill for me
You want to back these up with powerful threats like Mosswood Dreadknight and Dark Confidant plus a little card advantage from spells like Night's Whisper to extend your advantage
These rankings may have little impact on the Standard metagame, or be a part of many YouTube or Twitch videos, but robots are cool dang it