Aranel, Oil-Scarred

Metalcraft - When Aranel, Oil-Scarred enters the battlefield, if you control four or more Artifacts,
you may pay X life, where X is the number of Artifacts you control, rounded down. When you
do so, search your library for a creature card with
mana value X or less and add it to your hand.
{t}: Exile Aranel, Oil-Scarred, then return it on
the battlefield under its owner control.