The Life Sapper is a melee attack monster that belongs to the Death splinter. It has moderate speed, moderate melee attack and low health, but it also has an ability called "Sap Life" which allows it to heal itself for the amount of damage it deals to the enemy monster.
The Life Sapper can be a valuable addition to a Death splinter deck, due to its ability to sustain itself in battle. It can also be used to surprise opponents by healing itself unexpectedly. It is a good card to use as a "finisher" to defeat the last remaining enemy monster after it has been weakened.
It's useful to pair it with other cards that have healing abilities, or cards that can boost its attack and speed.
Overall, the Life Sapper is a solid card with a unique and useful ability, but it may not be the best option in all situations. Its low health and moderate attack make it a bit fragile, but if played well, it can be a valuable asset to your deck.