This ingenious loop turns our favorite little goblin into a self-sustaining engine by exploiting the unique card pool granted by Realmwalker's changeling ability, which ensures every creature type is always chosen. When you sacrifice Skirk Prospector to its own ability for red mana, Mortuary catches it on the way to the graveyard and neatly places it right back on top of your library. From there, Realmwalker allows you to cast Skirk Prospector directly off the top of your library using the very mana you just generated, fueling an endless cycle that produces infinite death triggers, sacrifice triggers, and storm count.