For the vast majority of my test games, once I cast Purphoros one time, he'd stick around for the rest of the game
On the other hand, if you are targeting and controlling an opponents graveyard yourself, Havengul Runebinder is of use, which can remove creature cards from any graveyard for 2Bl to create a 2/2 Zombie token and put a +1/+1 token on each Zombie controlled
Without Fortisphere, we may see Sapphire/Steel resort to a more tempo-based version like the one that was popular last season
By the time the TCG became fully established, much of the first edition had already sold out, making these cards particularly rare and sought-after
There are a number of Sphinxs Revelation hate cards in Dragons Maze, so maybe the scale will be tipped, but so far it is just hard to imagine getting away from Sphinxs Revelation in a control deck