Hardcore Leveling Warrior

Your Commander enters the battlefield with a
Luck Counter for each time it has been cast this
game. Luck Counters decrease the number you need
to role a 20 on a D20 by 1. Every time your
Commander deals Combat Damage to a Player,
it gains 1 Luck Counter. Whenever you score a Critical Hit (20 on a D20), proliferate. If your Commander is dealt damage, prevent that
damage and remove a Luck Counter from it. If
you score a Critical Miss (1 on a D20), remove
all Counters fr