If you conquer and remove Brush, can you also use the Battlefield you revealed or not that same turn?

To determine if you can use a battlefield you "swapped back" to (or revealed) after replacing a Brush token, we must look at the rules regarding scoring limitations and how Brush functions.

The Ruling: No

You cannot use the restored battlefield's conquer or hold effects to score again that turn if you have already scored a battlefield earlier in that same turn.

According to RiftJudge FAQ #2805 and Rule 465:

• A player may only score a given battlefield once per turn, regardless of the method used (Hold or Conquer).
• Because conquering is inherently tied to the act of scoring a battlefield (Rule 464.1), you cannot trigger conquest effects if you are unable to score the battlefield.

Why swapping back doesn't reset the limit:

When you use the "Swap Back" ability on a Brush token (as described in RiftJudge FAQ #9912 and Rule 438.7.b), the original battlefield is returned to the space, inheriting all current effects and statuses—including the fact that it has already been scored this turn.

1. Scoring Limit: If you have already scored by holding or conquering this turn, you have reached your scoring limit for that location. Replacing a token with the original battlefield does not reset this restriction.
2. Conquering: Since conquering is a subset of scoring, if you cannot score the battlefield (because you already scored it earlier), you cannot trigger its "When you conquer" effects, even if you just "swapped back" to it.

Summary

If you have already scored a battlefield this turn:

• You cannot conquer it again, even after swapping back from a Brush token.
• You cannot trigger conquest-based effects again.
• The game treats the restored battlefield as having already fulfilled the scoring condition for that turn.

If you have not yet scored that turn, swapping back to your original battlefield would allow you to trigger its effects if you were to conquer it (by taking control and scoring), but once you have scored, you are locked out for the remainder of the turn.