R/S Spells is good at casting several cheap actions a turn in order to generate card advantage and dig for your payoff cards in Candlelight, Psychic Ascension, and Engorged Gobbler. Out of the reserves, these lists can transform into either a more aggressive strategy or get slower with more counterspells and top of the curve threats like Eternal Seeker.
Comparable Archetypes in Other Games
Hearthstone: Tempo Mage
MTG: U/R Counterburn, Jeskai Flash
RomosSJR’s R/S Spells (Singles Night 2-1)