Oltek Guardian

First-strike, Vigilance, Deathtouch.

Spells and abilities opponents control can't cause you to sacrifice permanents, or return
them to your hand or library.

Gigas you control gain Trample, Reach, and
"Can't be blocked by more than one creature" (Giants, Ogres, Golems, Cyclops, Treefolk, Trolls, Dinosaurs, Dragons and Juggernauts are Gigas)