As theyre enchantments, Rooms trigger constellation when they enter the battlefield and, more usefully for Duskmourn, eerie
Being able to turn already powerful cards like Dismember or Toxic Deluge into more cards feels great because you won't be exhausting all of your resources when you remove creatures
Terra, Herald of Hope Your combat step fuels Terra, Herald of Hope: You mill two, Terra gets flying, and when it connects you can pay 2 to reanimate a creature with power 3 or less, tapped
We also have cards like Leyline Binding with flash and a mana discount, often in the 2-3 mana range
This is important, as whenever Nethroi mutates, its controller can return any number of creature cards with total power 10 or less from their graveyard directly to the battlefield.This can bring back a massive board state from the graveyard with the effect of a single card, potentially swinging the game in its controller's favor
You can add in hexproof creatures and play a Voltron- / Bogles-style deck, head toward enchantment creatures like Courser of Kruphix with Kestia, the Cultivator leading the way, or go all-in on comboing off with Estrid, the Masked and The Chain Veil