The counts are an automated, heuristic read of card text a fast starting point, not a final verdict and categories can overlap (a card that draws and ramps counts in both)
Oh, and if you havent seen what mass goad can do, then check out Rachels deck on Extra Turns
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
If the creature or planeswalker isn't a legal target as this spell tries to resolve, it won't resolve
Playing some games with a few extra points of life was very good in some matchups and some formats even had life gain matters themes which these played into perfectly