If I hold on a battlefield with a single unit, and then gank to Seat of Power, do I draw still even though I no longer have units on Seat of Power?

Ruling

No, you do not draw a card.

To conquer a battlefield, you must establish control of it. According to Rule 187.4, control is established by having units at a battlefield at the end of a showdown or combat. If you leave a battlefield empty at the end of these processes, you do not establish control, you do not "Conquer" the battlefield, and any "When you conquer here" triggered abilities will not activate.

Sequence Breakdown

1. Ganking: When you use a Standard Move to gank a unit, leaving your initial battlefield empty, you may create a Contested status at the destination battlefield (Rule 187.3.a).
2. Showdown: A contested battlefield requires a showdown during the subsequent cleanup (Rule 323.8).
3. Showdown Resolution: If you have no units remaining at the battlefield at the conclusion of the showdown or combat, you fail to establish control (Rule 187.4).
4. Conquer Condition: A "Conquer" is defined as the act of gaining control of a battlefield (Rule 464.1). If control is not established, the condition for the "When you conquer here" ability is not met.

Addressing the Rules Confusion

Per Rule 187.4.c and the 2026-04-29 Rules FAQ Clarification, control of a battlefield is lost during the following cleanup if you have no units present and the state is open. Because the move initiated a contested state, the game tracks control through the showdown process. If you end the showdown with no units at the target location, the "When you conquer here" effect is not satisfied.

Note: I could not fully verify this ruling against the retrieved rules, as the specific card text for "Seat of Power" was not provided.