And as a grindy sideboard tool there are likely just going to be much better options across the board, between a suite of 4 mana cards that are approximately as easy to cast as Spyro is
Let's examine the strongest legendary Vampires from Magic's history
Enchantment Color tag templates(None) Hydra's Growth Enchant creature When this Aura enters, put a +1/+1 counter on enchanted creature
This limits the options to the other three colors
Morph, Space Goo is a wonderful little emerald card that enables players to place any card with the Shift keyword on top of it, regardless of the cards usual requirements
If you do have lots of Zombies, which probably means the UB color pair, it is probably worth playing -- but you probably need around 10 before you get there, and even then, the turn you place this it will do stone nothing