The main difference between spree and escalate is that with escalate, the base mana cost of the spell includes the first mode, whereas this isnt the case with spree
When paired with the Yanmega from Steam Siege, it is able to use its attacks for free, thanks to Yanmegas Sonic Vision ability
Creatures (30) 4 Adanto Vanguard 4 Dauntless Bodyguard 4 Knight of Grace 4 Knight of Malice 2 Valiant Knight 4 Midnight Reaper 3 Corpse Knight 1 Cavalier of Dawn 4 Knight of the Ebon Legion Planeswalkers (1) Lands (22) Spells (7) History of Benalia has always been the main payoff for any Knight strategy
Without it, the game would definitely be different
Blood Artist Blood Artist and its many imitators are among the most reliable damage sources in aristocrat decks that might otherwise struggle to close out the game as they fiddle around with Putrid Goblin, Yawgmoth, Thran Physician, and similar cards