Dont hold back
Watchwolf Loxodon Smiter Loxodon Hierarch Advent of the Wurm Armadillo Cloak Behemoth Sledge Eladamri's Call Feremef Enchantress (Enchtress decks only) Glittering Wish Mystic Enforcer Captured Sunlight (as a combo enabler) Qasali Ambusher Safehold Elite Seedcradle Witch (as a combo piece) Sterling Grove (Enchtress decks only) Thaumatog (Enchtress decks only) Sundering Growth Wildfield Borderpost Wheel of Sun and Moon
Skullbriar Counter Voltron Skullbriar, the Walking Grave was one of the very first decks I built when I got into Commander back in 2011
Auras you put on other players' creatures are a little bit harder to remember, Mind Control effects are harder to play than normal, and cards which search your opponent's deck (like, say, Praetor's Grasp) are nightmares to resolve
Still, good tutors always see extensive play, and even if it gets relegated to Commander and nowhere else, the demand should keep the price fairly high.
Holon Mentor and Holon Legacy both fit well within the Holon engine model of building decks, as did the energy spread that included Holon Energy FF, Holon Energy GL, Holon Energy WP, as well as Boost Energy, Scramble Energy, and Rainbow Energy
