Dark Arts is a warlock Hero Power that only appears in Duels.
Gallery
Patch changes[]
Patch 20.0.0.77662 (2021-03-25):
Now reads: Look at up to 3 cards... (previously: Look at up to 4 cards...).
Patch 18.6.1.65000 (2020-11-05):
Now costs 1 mana (Down from 2).
Patch 18.6.0.63160 (2020-10-22):
Added.