Turioph, the Endless Tinkerer

Player (Creatures blocked by Turioph gain trample until end of turn. Turioph cannot be removed from the battlefield.)
At the beginning of your upkeep, you may sacrifice an artifact. If you do, you may search your library for an artifact card with converted mana cost X or less, where X is the sacrificed artifact's converted mana cost minus 1.
Mana Pool - {u} or {r}