Tweakz, Tha Giant KillaBot

Giant KillaBot enters the battlefield search your graveyard and/or library for a card named
Gromok, Tha Cascade Bossz and put it into your
hand. If you search your library this way, shuffle.
Loot, trample, menace.
Boss spells you cast cost {4} less to cast.
"What's betta than a KillaBot? A Giant KillaBot!"
—Gromok, Tha Cascade Bossz