In addition to the cards Constructed appeal, Summon: Knights of Round is also a solid addition to any Saga Commander deck, such as those built around Tom Bombadil
Gaining you 2 life every single turn regardless of the zone its in offers incredible consistency for your lifegain triggers, turning your otherwise mid-tier value creatures into powerhouses
Either of these two investigating stories can exist within the framework of the story and both work with the cards in the set as well
Journey into Nyx Standard | Michael Yee Creatures (16) 2 Archangel of Thune 4 Courser of Kruphix 4 Nyx-Fleece Ram 4 Sylvan Caryatid 2 Obzedat, Ghost Council Planeswalkers (1) 1 Elspeth, Sun's Champion Spells (20) 1 Ultimate Price 1 Devour Flesh 2 Bile Blight 3 Hero's Downfall 4 Abrupt Decay 3 Thoughtseize 3 Banishing Light 3 Underworld Connections Lands (23) 2 Mana Confluence 2 Temple of Malady 3 Overgrown Tomb 4 Godless Shrine 4 Temple Garden 4 Temple of Plenty 4 Temple of Silence Sideboard (15) 3 Blood Baron of Vizkopa 2 Deicide 1 Devour Flesh 1 Doom Blade 3 Duress 1 Erebos, God of the Dead 2 Golgari Charm 2 Sin Collector This is a Junk Midrange deck that actually started out as a fun, casual idea since I love synergies between my cards
While it has some of the better card art of its time, the monsters that are required to summon Darkfire Dragon aren't ones that should ever be used, as they are both terrible Normal monsters with low ATK and DEF stats