Can Roll the Bones be used?

Today is the turn of Roll the Bones

The most important card in this deck is Dollmaster Dorian, in turn 7+, you summon it and cast RtB, drawing a lot of Deathrattles and summon a 1/1 copy of they, Spiritsinger Umbra help us with more deathrattle combos, like Cube or any other that cost <7, if you have coin, you can have a turn of Dorian, Umbra and RtB; Necrium Blade give us so much because is a “Deathrattle card” (so don’t stop RtB) and activate Deathrattles

Umbra +  Meat Wagon = summon an egg and active its deathrattle