The ability to sacrifice it to tutor any other land in a player's deck is certainly powerful, though an effective 4 mana (3 + tapping Urza's Cave) to activate is a steep cost in a format as potentially fast as Modern
Opal Palace [Cat deck]: That's pretty good
Retrieved December 22, 2014
This can be used politically to allow you to get away with playing a powerful creature or asking for a favour from an opponent
Sindbad (T1, S) OK, I hear my audience saying, Why is a marginal creature which hasn't seen play since Fourth Edition sitting on this list
There are 24 artifacts in the deck (the same number as creatures), meaning youre likely to build quickly and start to snowball particularly with bigger artifact spells making TChalla, the Blank Panther, stronger