Forgotten Realms' Manlands Cave of the Frost Dragon Hall of Storm Giants Hive of the Eye Tyrant Den of the Bugbear Lair of the Hydra We hadn't seen a cycle of mono-colored manlands since Urza's Legacy (Faerie Conclave, Treetop Village, etc.), and the Forgotten Realms versions even enter untapped most of the time
Dark Charizard and Dark Blastoise show up looking rougher and meaner than usual
And these services may not be 100% accurate
Instead, enchantments are a permanent presence on the battlefield, exerting continuous effects so long as they stay up
By holding priority, you can actually activate this ability as many times as you want
Duskmourn Of all the sets rotating, Duskmourn: House of Horror has arguably had the biggest impact on Standard