Not to mention, light flares that would get JJ Abrams excited
The best I can come up with is stealing permanents and perhaps changing their creature types or making them artifacts, which all sounds highly blue/black to me
Also, they all enter the battlefield tapped, as most non-basic lands do
Crystals are usually depicted as being sentient and will even be able to speak with the user, in a gameplay technique that allows the narrative to continue moving forward
A sort of tingling sensation
Wound Reflection, Warlock Class, Bloodletter of Aclazotz, and anything worded like this doubles your damage, which is sometimes enough to one-shot players with commanders like Heartless Hidetsugu or Alpharael, Stonechosen