+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
Arcanum Monitors will be affected by both abilities if there is another Arcanum Monitor in play.