For a spell with a returning mechanic as powerful as Gravestorm, thats all you can ask for
7.0%inclusion 1.4lift 8 decks 114 decks Crystal, Inhuman Princess 5.6%inclusion 0.7lift 3 decks 54 decks Captain America, Living Legend 4.9%inclusion 0.5lift 6 decks 122 decks Hidden Lair 4.2%inclusion 0.4lift 5 decks 120 decks Mister Fantastic, Reed Richards 4.1%inclusion 0.5lift 5 decks 122 decks High Lift Cards Prismari Pianist 22%inclusion 2.0lift 229 decks 1.02K decks Harried Spearguard 8.3%inclusion 2.0lift 317 decks 3.81K decks Ghired's Belligerence 9.0%inclusion 1.9lift 345 decks 3.81K decks Fury Storm 29%inclusion 1.9lift 1.10K decks 3.81K decks Mogg War Marshal 16%inclusion 1.9lift 601 decks 3.81K decks Flamekin Herald 19%inclusion 1.8lift 706 decks 3.81K decks Young Pyromancer 30%inclusion 1.8lift 1.16K decks 3.81K decks Hordeling Outburst 7.4%inclusion 1.7lift 281 decks 3.81K decks Blood for the Blood God
The fact that you can play Vivi and immediately play any number of free spells to grow Vivi and deal damage to the opponent makes it a very scary card
Sorin of House Markov / Sorin, Ravenous Neonate Sorin of House Markov provides a fine source of life drain
You do not need to tag that much on to this card to make it look like clearly good value
The Necrons are basically an army of robotic skeleton warriors, so putting them in black and making them artifact creatures makes a lot of sense