When attacking with Showstopper, can another unit come with the spell target?

Question

Accepted Answer

No, another unit cannot join the attack alongside the unit targeted by **Showstopper**.

According to RiftJudge FAQ #4987:
> "Ruling: When you move a unit with a spell like Showstopper or Leona's spell, you cannot move other units alongside it - the unit must attack alone."

**Key points regarding this interaction:**
*   **Showstopper** moves only one unit (FAQ #4591).
*   Because the movement is performed by a spell and not by a standard move action, the moved unit cannot be followed by other units (FAQ #4035).
*   Standard movement and non-standard movement (like spells) cannot be combined to bring multiple units into a battlefield before the showdown (FAQ #2357).

This is my interpretation based on the referenced RiftJudge FAQs. No official core rule number specifically lists this limitation, but it is the established mechanical precedent for spells that move units.