Mass Removal If you are on the slower end of things and are not making use of many support creatures then including a mass removal spell is well worth it
All Hallow's Eve Armageddon Clock Brambleback Brute Burdened Stoneback By Gnome Means Chisei, Heart of Oceans Clockwork Avian Clockwork Beast Delay Divine Intervention Etched Slith Fain, the Broker Ferropede Flitterwing Nuisance Gavel of the Righteous Glen Elendra Guardian Hexavus Hovel Hurler Hungry Hungry Heifer Leatherhead, Swamp Stalker Loch Mare Medicine Runner Mister Hyde, Monster Within Moonlit Lamenter O'aka, Traveling Merchant Power Conduit Rasputin Dreamweaver Sanctuary Warden Scholar of New Horizons Slumbering Walker Soul Diviner Spinal Parasite The Duke, Rebel Sentry Thrull Parasite Xavier Sal, Infested Captain
With cards like Sun Titan, Sevinnes Reclamation, and Brought Back, Roadside Reliquary is a solid little card draw engine
Theres also Ajani, Adversary of Tyrants which works well with the mentor creatures in Boros, as well as the next card on the list, and its hard to justify fitting four copies of a four mana legendary creature in the maindeck
Summon: Knights of Round may not see regular play due to its high cost and slower payoff compared to other more competitive options available
