+1/+1 for each of your other units.
Your other units have +1/+1.
The mages of the Praxis Arcanum report a breakthrough in their efforts to understand the ancient Sentinels: this one seems to have taken a liking to the initiates. Further testing — and stronger chains — are required.
Arcanum Monitor is a Unit.
How to Get Edit
This card can be obtained by winning matches during it's promotional period, otherwise it can be crafted.
Arcanum Monitors will be affected by both abilities if there is another Arcanum Monitor in play.