Does Volibear's draw effect trigger when he is on the base, or does he need to be at a battlefield?

Ruling: Volibear must be at a battlefield for his draw effect to trigger. When Volibear is on the base, his effect does not trigger because "other than mine" requires "mine" to be defined as a battlefield.

Nuances:

• The effect triggers once per move action, not per unit moved (if 3 units move together, draw 1 card)
• Playing a unit directly to a battlefield is not considered "moving" and does not trigger the effect
• It is unclear whether the effect triggers if you (the Volibear player) move an opponent's unit to a different battlefield, though the reasonable ruling is that it does not trigger since "opponent" refers to the opposing player taking the action