Artifact monopoly
Artifact monopoly is an unofficial term that describes a tactic for the turn's first human player of every month. Since all Artifact Merchants carry the same stock, the human player who is first in turn gets the first choice of artifacts to buy every month. This can be a huge advantage during multiplayer game as the computers usually act after the human players, depending how the game was set up.
If playing with Shadow of Death expansion, a solid use of the strategy is to buy every combination artifact piece they can afford at the first round of the month. After a few months, and with some luck in adventuring, the first player - using this tactic - may combine few of the easier combination artifacts like Bow of the Sharpshooter, Cloak of the Undead King or Wizard's Well - all quite powerful.