The core of the deck is the Spectral Pillager death combo, done by:
0. Invoking at least twice with Praise Galakrond & Seal Fate to activate Umbral Skulker
1. Play Umbral Skulkers into Spirit of the Shark, which gives you 6 coins and thus making them a net gain of 2 mana.
1,5. Bounce the Skulkers around with Shadowsteps and Tenwu for more gratuitous card usage.
2. Keep going until you can’t anymore, then snipe the opponent with Spectral Pillager for over 30 damage.
Lorekeeper Polkelt is there to give an alternate path to victory in long games where you’ve played all 4 Invoke cards in the deck; he will put Galakrond on the top of the deck, who will then subsequently draw into 0 mana Sharks/Skulkers/Pillagers, handing you the win right then and there.