Acimef, Esper Tick

{1}{w/b}{u/b}: Target player puts the top card of his or her library into his or her graveyard, if it's an artifact you gain life equal to its converted mana cost.
During your upkeep, you may put target artifact card from your graveyard on top of your library.
Acimef, Esper Tick gets +1/-1 for each Artifact you control.