Esper Ephemerate leans on enter-the-battlefield value from Baleful Strix, Mulldrifter, and Archaeomancer, and Nihil Spellbomb is a cheap way to exile their graveyard in response to Archaeomancer's return-an-instant-or-sorcery trigger, cantripping later if you can pay {B}. Blue Elemental Blast is a poor pick because their main deck has no red cards to counter or destroy. Red Elemental Blast does have real targets, since Counterspell, Dispel, Lorien Revealed, Mulldrifter, Archaeomancer, Murmuring Mystic, and Baleful Strix (both blue and black) are all blue. It is still a narrow card that needs {R}, so it is not part of this plan. Refurbished Familiar is black and the artifact lands are colorless, so Red Elemental Blast can't touch them. Crop Rotation is the easiest cut since this matchup is a grindy value fight where consistent Tron assembly matters less than card quality. Keep Ancient Stirrings and the big creatures to fight through their counterspell suite.