Haron, Mercenary Tank

Companion— Your starting deck contains, only creatures with 4 power or less.
Whenever this creature is your companion or in command zone you start with extra life equal to is toughness. If it enters combat, you gain 20 life.
This creature can't attack, whenever it would take damage, put that many -1/-1 counters on it
instead and you lose that much life. When it dies
exile it.