Thaddius Brood has been a game changer for the Death Splinter for me. With it's -1 Magic and -1 Health and you pair it with the Bone Golem, you pretty much negate a lot of the magic damage.
The Bone Golem is slow though so that's one thing going against it. You could use the Cursed Windeku for its Thorns and with its high speed and high health bar, it is quite the tank.
Of course, every one else knows and uses this strategy so it doesn't generate much alpha, so to speak.
It was hard to get a streak going but I am competing in Silver III and not the usual Bronze I so it is quite forgivable to struggle in these early stages of the season.
Rewards weren't that great... a common card and a small amount of DEC. But at least it isn't credits.