Venser, the Sojourner

Whenever you cast a spell, the emblem’s ability triggers and goes on the stack on top of it. It will resolve before the spell does.

Venser’s last ability creates an emblem with a triggered ability. The emblem is the source of the triggered ability. Because emblems are colorless, you can target permanents with protection from white or from blue, for example, with the triggered ability.

Emblems behave similarly to enchantments: They have an ability that, in a general sense, continually affects the game. The primary difference between them is that emblems aren’t permanents and don’t exist on the battlefield. Nothing in the game can remove an emblem, simply because no other spell or ability references them. Once you get an emblem, you keep it for the rest of the game. Emblems have no color, name, card type, or other characteristics beyond the listed ability.