#adding types

[alastorvortex]

@tanner111

[magicjudge]

Does activating haunted plate mail's 0 ability trigger purphoros? Also would an animate land IE creeping tar put trigger purphoros as well?

No.

Those permanents are already on the battlefield. Gaining a new type, i.e. creature, doesn’t cause them to change zones or otherwise trigger abilities that look for creatures to enter the battlefield.