I was playing Brawl, and then my opponent play Ureni (8 mana) on 6 lands (6 mana), which was super confusing for me. I was recording too, in case you need more proof than the screenshot. There you can see that the last spell they cast was a growth spiral, there are 6 lands on the field, and Ureni was casted. Topiary stomper can't attack or block, so there are less than 7 lands on the field. I don't know how was that possible