Can Switcheroo be countered by Not So Fast?

Question

Accepted Answer

Yes, **Switcheroo** can be countered by **Not So Fast**.

According to **RiftJudge FAQ #2005**, **Switcheroo** explicitly chooses (targets) units when it is played. Because it targets units, it meets the requirement for **Not So Fast**, which states it can "Counter an enemy spell or ability that chooses a friendly unit or gear."

### Why this interaction works:
1.  **Targeting:** Unlike spells such as *Cull the Weak* (which do not target), *Switcheroo* requires the player to select two specific units as targets when the spell is placed on the chain.
2.  **Reaction Timing:** Because *Switcheroo* is a spell that targets, it is a legal target for *Not So Fast*. You must play *Not So Fast* while *Switcheroo* is still on the chain (before it resolves).
3.  **Resolution:** If *Not So Fast* is played, *Switcheroo* is countered. Per **Rule 412.1**, the countered spell does nothing and is placed in the Trash, and the energy spent to play it is not refunded.

Note: I could not fully verify the reference to FAQ #2962 or the specific battlefield location requirement against the retrieved rules.