Ramp/Mana: especially mana rocks. No brainer. The thing about Shattergang is you can't just be forcing one sac, you need to be hopefully forcing multiple sacs.
Multiplying his ability. Rings of Brighthearth, Illusionist's Bracers, Helm of the Host.
My 'flava' take: Kormus Bell! This lets you use Urborg, Tomb of Yawgmoth, and all the usual lands going to/from graveyards cards. Mycosynth Lattice also makes everything a potential 'target' for Shattergang and lets you use Clue tokens as weapons.
But the most important point is 'one'. shattergang needs lots of mana to convert into ability activations and to be re-cast. Command Beacon, Cryptolith Rite (for all the token sac bait you'll have), Ashnod's Altar.
January 2, 2019 9:04 p.m.
Thanks for the tips Rings of Brighthearthmaybe a little more than I want to spend on a card for this deck with the others that are needed but the other two and the land should make it a lot better