Prism, Advent of Thrones [SAT001] (Silver Age: Usurp the Shadow Throne)

Whenever a card with Herald in its name is put into Prism's soul during an action phase, you may search your deck for a figment, put it into the arena, then shuffle. Once per Turn Instant — [2 Resource], banish a card from Prism's soul: Awaken target figment you control.