These cards range from the crazy and overpowered, when the network is trained poorly, to the interesting and playable, when the network is trained well
There may be some better commanders in my opinion, but Greyfax is only a little bit behind them and that makes it a great choice to run in the main decks
This is at instant speed so you can do it to dig and find an answer, unlike most of these effects
Both Eldrazi Temple and Eye of Ugin work exclusively with "colorless" Eldrazi creatures
You need four creatures with the same type in play for this to net you mana, and even in this format that's way too big of an ask
Apart from these cards, the rares from Unhinged and Unglued are basically worthless, and even the handful in the $23 range are pretty hard to sell for a reasonable price, with high spreads if you look to sell them to a buylist and little demand in trade binders