Golgari Midrange brings heavy discard (Duress, Deceit) and removal (Requiting Hex, Deadly Cover-Up, Maelstrom Pulse), so Surrak, Elusive Hunter's uncounterable trampling body is a great answer that also draws us cards whenever they target our creatures. The extra Mossborn Hydra provides another resilient threat that survives Requiting Hex (mana value 2 or less only) and punishes them for durdling with removal instead of pressuring us. Esper Origins comes out since it's too slow against a deck that can Deadly Cover-Up our board and grind us out with card advantage from Unholy Annex.