Whenever Second Role Test 2 attacks, if Second Role Test 2 is a Knight, you may
. If you do, Second Role Test 2 gains menace until end of turn.
Whenever Second Role Test 2 deals combat damage to a player, destroy up to one target artifact or enchantment that player controls.
See Cares About Creature Types Test 1.
It's intentional that this does not have a built-in way to become a Knight on its own.