With Yuki's deck being structured around Elemental Heroes, Skyscraper synergized with almost every card of his
Big Core (Updated from: Big Core) B.E.S
The different types of green card draw being discussed are: Instant speed green card draw Green card draw Sorcery spells Artifacts & Enchantments with green card draw abilities Green creatures that can draw you cards On top of all of that, there is a little bonus Planeswalker section at the end that talks about a few walkers, but mainly highlights a specific Garruk Planeswalker
Or just Albaz
But beyond all else, the power of the Nekroz theme lies in its consistency with Nekroz of Brionac able to search any Nekroz Monster and Nekroz of Clausolas able to search any Nekroz Spell/Trap (heh), they can grab whatever they need to successfully Ritual Summon
Szarel, Genesis Shepherd lets you play lands from your graveyard, and there are a ton of landfall effects that play into that, too