Question about Card Limits in Shandalar

I have been introducing my son to MtG and Shandalar. So great to see that it continues to exist. Couldn't find the answer by searching the forums, so here goes.
Are decks in Shandalar now subject to restrictions? My son couldn't add 4 goblins to his 40 card deck. In the original game there were no card restrictions since rarity was controlled by the number of cards in the world and by ante. I felt this was one thing that made it very much like early Magic. I loved playing the game and using bronze tablets to steal moxes from my opponents. I would hate to find out that I can't have 2 mox pearls in my white deck.
Thanks for any feedback on deck and card limits for Shandalar portion of MtG
Growf
Are decks in Shandalar now subject to restrictions? My son couldn't add 4 goblins to his 40 card deck. In the original game there were no card restrictions since rarity was controlled by the number of cards in the world and by ante. I felt this was one thing that made it very much like early Magic. I loved playing the game and using bronze tablets to steal moxes from my opponents. I would hate to find out that I can't have 2 mox pearls in my white deck.
Thanks for any feedback on deck and card limits for Shandalar portion of MtG
Growf