It is a bit too complicated / weak.
6 Heals, will heal you by 120hp if you play them all in one turn.
6 of these, will heal you 63hp, and you have to wait one turn.
Another thing,
already has a Permanent which heals (a ridiculous amount). Feral / Empathic Bonds heal +1 for every creature in play. That is an insane ~120hp every turn with a full board of creatures and 6 bonds.
I do like the on-death/sacrifice to heal feature though... Maybe make the card have an aggressive or defensive ability, and then on-death or stealing you gain hitpoints?
Here's my thoughts on a version, taking into account what I have said above.
Name: Vine Barrier / Vine Wall (Upgraded)
Cost: 2
/ 1
Ability (Passive): Attacking creatures have a chance to become entangled.
Ability (On Death): You gain 15 health / 30 health (upgraded)
Notes: Entangled is exactly like 'Time Bubble', except for
.
Notes (continued): The chance to entangle is 10% for every Barrier or Wall in play.
What do you think?