Grixis Affinity floods the board with small, cheap artifact creatures like Refurbished Familiar (2/1) and Myr Enforcer (4/4 but costed down), making Fiery Cannonade's 2 damage to each non-Pirate creature a strong sweeper against Refurbished Familiar and other small bodies while being irrelevant to their artifact lands. Cast into the Fire can deal 1 damage to each of up to two target creatures to finish off anything Cannonade doesn't fully kill, or exile a key artifact such as Blood Fountain to stop it from returning their dead creatures to hand. Vampire's Kiss and the extra Sazacap's Brew are too slow against a deck that curves out fast with free or near-free threats, so they're cut for proactive removal. Prioritize killing their board before Myr Enforcer and company overwhelm you, since this deck can also race you with Galvanic Blast once it hits metalcraft.