Entrapta, Mad Scientist

Artifact spells you cast cost {2} less to cast.
{2}{u/r}{u/r}, {t}, sacrifice an artifact: search your
library for an artifact card with a converted mana
cost equal to or less than the sacrificed card's converted mana cost, and put it onto the battlefield. Shuffle your library afterwards.
"Now they're obsessively trying to destroy us! What an unexpected twist!"