I have noticed that there are a few land cards that are tagged as non-colorless in the Portal Second Age set:
- one Plains and one Swamp tagged as White
- one Island and one Forest tagged as Black
- one Swamp tagged as Black
- one Plains tagged as Red
once that issue is accounted for, there should be 30 cards in each colour in that set, which I believe is correct.
Keep up the goos work!