Seeded Night's Edge has some of the least RNG out of any category in the game, and it's a great way to test your skills. To play it effectively, you need to downpatch to 1.4.0.5, and then use these seeds:

Hermes Boots Seed: 1.4.1.13056576 Magic Conch Seed: 1.4.2.1690143099 Corruption Seed: 1.4.1.1678060735 Primary Seed: 1.4.1.68463366