cards with mobilize mtg (Card) and it becomes a Vampire in addition to its other types. mobilize mtg cards MTG Magic

Crystalline Sliver Dementia Sliver Diffusion Sliver Dormant Sliver Frenetic Sliver Galerider Sliver Hibernation Sliver Mesmeric Sliver Mistform Sliver Mnemonic Sliver Opaline Sliver Psionic Sliver Screeching Sliver Scuttling Sliver Shadow Sliver Shifting Sliver Sliver Gravemother Sliver Hivelord Sliver Legion Sliver Overlord Sliver Queen Synapse Sliver Synchronous Sliver Taunting Sliver Telekinetic Sliver The First Sliver Winged Sliver

Its a big, mono-black creature with no real home, and thats a shame

Sacrifice it at the beginning of the next end step.) , Sacrifice this creature: It deals damage equal to the number of creatures you control to target creature

How would you upgrade them

If a 6/6 enters with five -1/-1 counters, 6/6 is its upper limit