From the official release announcement:
"Deep in the sands lies an arcane temple forsaken by a ruined kingdom. Deep in that temple lies an imposing tomb burnished with mystic runes and emerald scarabs. Deep in that tomb lies an ancient being of treacherous power.
These guys guard the temple next to that one.
Stand watch over the desert with Guardian of the Sands Rammus and Skarner for 975 RP each or Guardian of the Sands Xerath for 1350 RP (on sale for 975 RP through May 1.)"
Click the picture to jump to each champion's preview screenshots and video!
1350 RP (On sale for 975 RP through May 1st)