Devourer

[Sunrise Samurai]

Not a human idea really, but try for undead

Devourer
Cost 4
Hp 25
Power 10
Armor 2/2
Speed 3
Sight 5
Spell resistance 25%
Abilities:
Devour corpse (as consume corpse, but +5 max and current hp every use, permanent)
Lifelink
Hunger (form of veteraning that gives +3 hp per kill, but nothing else)
Metabolic increase: gives self a permanent +2 power for -30 max and current hp, cooldown 5, can kill self.

Left unchecked, this can become a walking hp bag or a powerhouse of attack. Unlike most undead, it's possibly worth losing the potential skeleton to feed it a corpse and heal it. While regular veteraning gives hp (if it ever works right) armor, and power, this unit must choose to sacrifice hp for power if it is to be stronger.

[makazuwr32]

Can fit well for undeads.

[Savra]

Isn't the devourer a name of the scaledfolks dragon?

[makazuwr32]

That is dragon.
And this can be a mutant or something like that. Some experiment.

Name does not matter much.
Main part is idea