This guy gets it. The Spellstone doesn't fit into traditional Control Warrior decks. I could see this as a finisher alongside cards like Bonemare in a midrange/zoo type Warrior deck. Maybe Keleseth zoo warr with the spellstone?
eh... Medivh, N'zoths first mate and the Garrosh deathknight count as 3 Weapons to upgrade this card since those cards are playable and make you equip weaponss, so it's actually pretty easy to upgrade, the question is if it upgrades wherever it is or when it's in your hand, and it's the same for every spell stone, on the frmer scenario everyspell stone is pretty powerufl and worth running a deck for, on the later scenario every spells tone but the druid's one is pretty underwhelming.
I find the wording of this type of released cards utterly confusing, and I play a lot more complex card games. I get it, blizzard wanted to keep the text of cards as short as possible, but what is the point if you can't explain things in a clear way? Take as much space as you want to explain what the card does! No one likes half-assed descriptions.