If you control Targon's Peak at the start of your turn, lose control of it during your turn (e.g., by losing a showdown), and then conquer it again in the same turn, can you ready 2 runes at end of turn?

Ruling: No, you cannot ready 2 runes at the end of turn. You cannot score on the same battlefield twice in one turn, and conquering is a form of scoring.

Nuances:

• You could lose control of the battlefield by simply moving your units away, not just through losing a showdown
• This restriction only applies during your own turn; if you lost and regained control during your opponent's turn, the conquer effect could trigger again (though Targon's Peak's specific effect wouldn't be useful in that case)