It destroys all creatures with power 4 or greater , which often wipes the biggest threats while leaving your own token board intact
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Also like Chrome Mox they do not let you directly cut a land and count more like one and a half lands (or half a land in the case of Mox) which leads to more tunable decks and more precise builds
The addition of vigilance makes it that much stronger, but can block an additional creature each combat is such a unique effect, and in the format where most people claim to slot cards for redundancy, or still wrongfully cling to the 8x8 theory , youd expect High Ground to show up more
The fact that the tokens are non-legendary lets you jam cards like Old Gnawbone without worrying about the legend rule
It's already a solid creature with evasion and a low cost, but its real strength lies in its ability to give all your creatures indestructible for the turn