It is a reasonably recovery tool and a reasonable card to close the game out on its own or with support
The idea is simple: Throw down Slicer, likely converted as Slicer, High-Speed Antagonist to save some mana, slap on some equipment like Sword of Fire and Ice, Commander's Plate, and O-Naginata, then pass Slicer around the table and watch it shred your opponents life totals like a block of cheddar
Protection from creatures (Spirit Mantle) and protection from everything (Hexdrinker) are the only forms of protection that guarantee unblockability, though protection from a specific player (True-Name Nemesis) can do this in 1v1 Magic
Like with Horned Turtle, the information below the text box has been reformatted
If they guess right, Gollum goes home empty-handed, but if they guess wrong, you draw that card and Gollum becomes unblockable
A creature with the Hexproof keyword cannot be targeted by spells or abilities controlled by an opponent