Cryptic Trilobite enters and dies as a state-based action due to having 0 toughness, triggering Mortuary and Moldervine Reclamation.
Resolve the Mortuary trigger, putting Cryptic Trilobite from your graveyard onto the top of your library.
Resolve the Moldervine Reclamation trigger, causing you to draw a card, thus drawing Cryptic Trilobite from your library, and gain 1 life.
Repeat.
This clever loop transforms a doomed mechanical insect into an endless engine of life and knowledge. When you cast Cryptic Trilobite for zero mana, state-based actions immediately send it to the graveyard, instantly awakening the passive vigilance of both Mortuary and Moldervine Reclamation. Mortuary catches the falling creature and places it neatly back onto the top of your library, while Moldervine Reclamation rewards the death by letting you draw that exact card while ticking your life total upward. Repeating this cycle yields an infinite storm count, infinite death triggers, and infinite life, letting you draw through your entire deck in formats like Commander and Legacy.