Vanya, Cunning Findbroker

Sacrifice two artifacts: Target creature gets
+X/+X until end of turn where X is the
converted mana cost of the first artifact, and
target creature gets -X/-X, where X is the
converted mana cost of the second.
Pay X life: Return any number of artifacts from
your graveyard to the top of your library in any
order you choose, where X is the total converted
mana costs of all the artifacts you returned in
this way.