Some cards and strategies, especially those featured in sets like Tarkir: Dragonstorm and Aetherdrift, are designed to excel in multiplayer environments
Secret Lair x Dungeons & Dragons: Shadows Over Baldurs Gate Grim Hireling (137k decks, EA $20) Wild-Magic Sorcerer (81k decks, EA $13) Xorn (135k decks, Ampersand foil $30, SLD $14) Prosper, Tome-Bound (12k as Commander, 41k as card, EA $18) Another favorite theme for SLs is popular Commander plus some strong helpers and this is perfectly Prosper
Since it has the changeling ability, its technically a Wraith, and it will unlock cards from all five colors if you want to go beyond mono-black
Rather than try to use Nykthos as a Turn 3 mana boost, this deck uses it fairly as a way to power through on Turns 4, 5, and 6
Oracle has great scaling with library manipulation effects and is one of relatively few desirable four drop cards