A Delta Ancestral Memory has even sold for around $18,000, showing just how scarce and desirable these pieces of Magic history are today
The protection mechanic was introduced all the way back in Alpha
Well want to put Arms Race into a deck that creates value when artifacts die, like with Wurmcoil Engine or Mycosynth Wellspring
This creates a situation where some Masterpieces are wanted in multiples, compared to things like Minds Eye, which will be wanted as individual copies
Karoo actually lets you produce more mana with the same number of lands by returning one of your Plains to your hand, and lands like Buried Ruin can help retrieve a mana rock or another key artifact lost early in the game
If you do, exile them, then meld them into Ragnarok, Divine Deliverance