Oath of Vishal

When Oath of Vishal enters the battlefield,
put the top 4 cards of your library into your
graveyard. You gain life equal to the greatest
converted mana cost among artifacts in your
graveyard.
At the beginning of your end step, if you control
a planeswalker, return target artifact from your
graveyard to your hand.
"For those who've run out of time. I will keep watch."