It is flavorful, but doesn't feel quite practical at the moment. The only problem is that I see very few possibilities for it to actually be used other than in a counter deck to a dark/death based CC deck, primarily because there is only one actually viable counter with dark/death that this card can have. But I am assuming that this is a slightly weaker card because it costs either/or quanta rather than both quanta, but while this balances its lower atk the ability doesn't make up for it. There are two combos viable
"Liquid Shadow is such a great combo with this card. It gives normal Vampire and +0|+1 each turn.
poison + accelerate = awesome trio combo."
When I realized that no, its a duo not a trio. (Dark / Gravity) But even then I can see voodoo doll being almost as good if not better for the niche. So my question becomes "what cards can be comboed with this card to make up for its weakness and overall worse stats?" The only other combo I see is only viable in upped play, if you make Eclipse grant Vampire, in order to give you effectively 5 ATK 2 cost vamps instead of the usual 6 ATK 5 cost vamps. What death card has any synergy with this card because the three cards that synergize, Cloak, Eclipse (upped), and Liquid Shadow, are all darkness. Perhaps something that works with death cards when they gain its death effect? (Vulture, Boneyard, Soul Catcher). Or something as simple as making Aflatoxin give the creature a active to infest other slots with a copy of itself each turn like a Malignant cell. (Not with Infest themselves)