Opponents of this card are usually concerned about new, powerful designs homogenizing the Commander format, and Archaeomancers Map is definitely an efficient enough card to be a talking point in that conversation
Minthara, Merciless Soul is a 2/2 for four that accumulates experience counters after your turn goes by with a permanent leaving the battlefield
Kozilek, the Great Distortion costs 10, but a deck fully-armed with Mana rocks like Mana Vault, Mana Crypt and Metal Worker can get this boy out in 3-4 turns
Personality Powers: Duelists often use deck themes that reflect their character, and their ace monsters particularly tend to symbolize them
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Another new mechanic is Alert