Two mana to cast and one mana to activate sends one land to your hand and a variable number of cards into your graveyard, the perfect place to reanimate them with some eldritch spell
This Paldean water type has very contrasting colors compared to its base version, which makes it stand out a lot
There's no arguing that this is a repeatable explore card with an upside to activating it
Rather than use discard people would historically use self mill so that not only would the Ghoul be in the yard but also 20+ power of dorks, perhaps some guaranteed way to recur is involving flashback cards and Narcomoeba
With ramp staples like Sol Ring, Cultivate, and Sultai Banner, youll have the mana you need to keep up the pressure and cast those expensive creatures early
To make actual use of this monster, Yuri added cards to his Deck to support it, including "Ultra Polymerization" to turn a monster used in a Fusion Summon involving that card into a Tuner