You pay all costs and follow all normal timing rules for cards played this way
That was fine and good, but like all things including the use of mass removal, things change with time to adapt to the circumstances
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
Its great to see cards like Dark Confidant and Liliana of the Veil find a home in newer formats after being power crept out of their old homes
Its at its best when you curve it out early and keep attacking every turn
Cards like scheming symmetry, brainstorm, crystal ball, and a number of scry cards can put your 6-9 mana spells on top of the library, so that Yuriko will bleed your opponents for massive amounts of damage each turn