Jawa sand crawler

Reach, vigilance, double strike, trample
Whenever this artifact/artifact creature block's a creature with flying destroy that creature and
you gain 3 life
{w}: this artifact/artifact creature gets either menace or hexproof until end of turn.
When this artifact/artifact creature enters the battlfield you amass 4 and you gain 4 life
Whenever you cast a {w} spell you gain 5 life
Crew 4 and Afterlife 6