Dimir Control is a grind-heavy mirror of sorts where both sides are trying to generate card advantage through creatures like Augur of Bolas, Ninja of the Deep Hours, and Thorn of the Black Rose while countering the opponent's key spells. Red Elemental Blast gives you free answers to their Counterspells, Brainstorms, Spellstutter Sprites, and Snuff Outs cast with blue mana, swinging tempo exchanges heavily in your favor. Your Ephemerate engine is the superior value engine here — flickering Augur of Bolas and Mulldrifter generates more raw cards than anything in their list, so protect those pieces and let the game go long. Lightning Bolt has few good targets in a deck full of Snuff Out and Augur of Bolas, and Ride's End is too temporary against a deck that recurs threats with Ninja and can just recast from hand. Watch for their Bojuka Bog disrupting your graveyard synergies if you have any.