Arvan, Vedalken Savior

Whenever Arvan, Vedalken Savior or another Vedalken enters the battlefield under your
control you may tap an untapped artifact you control, if you do, draw a card.
Tap two untapped artifacts you control: Tap
target nonland permanent
{1}{w}{u}, {t}: Untap up to two target artifacts
"Progress must be made"