{T}: Add {C}. {1}{S}: Until end of turn, Frostwalk Bastion becomes a 2/3 Construct artifact creature. It's still a land. ({S} can be paid with one mana from a snow source.) Whenever Frostwalk Bastion deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step.
![Frostwalk Bastion [Modern Horizons]](http://www.cardmerchanttakapuna.co.nz/cdn/shop/files/2f9624c8-faad-59a7-a397-9e78ea434bba.jpg?v=1731015331&width=1445)