He was so powerful that in one tournament, every single one of the top 8 decks was running 4 copies of him, almost unheard of in Standard.
Of course, this Ravager just happens to be a Giant Wizard, so this cards ability can also be used to brilliant effect in Wizard decks that want to stack the board with Wizard tokens or other inexpensive Wizard cards
Some examples: Swords to Plowshares, Teferis Protection, Chaos Warp, Great Train Heist (or other Spree cards, you pay extra costs but can go wild), Akromas Will, Deflecting Swat, Wear/Tear, and my personal favorite, Reprieve
Neera, Wild Mage decks are full of cheap cantrips like Ponder because, unlike proper cascade cards, Neera can free-cast anything from the top of the deck regardless of mana value
Skithiryx can also regenerate for , meaning its at least somewhat protected from removal