It prevents damage from outside sources and punishes attackers by reflecting it back
If an exerted permanent is already untapped during your next untap step (most likely because an effect untapped it), exert's effect preventing it from untapping expires without having done anything
Yes, this is whites Craterhoof Behemoth
[On Play] Return up to 1 Character with 5000 base power or less to the owner's hand
A 1st Edition PSA 10 copy can reach 20,000 to 40,000 euros, while a PSA 9 fluctuates between 5,000 and 10,000 euros
Its really, REALLY powerful to have dual lands that come into play untapped, and considering that these are best friends with the Surveil lands from MKM, were going to see a lot of Surveil/Verge manabases for all of 2025 and 2026