[Fire] Spirit Burner 10+ Discard the top 5 cards of your deck
Otherwise, I suggest using different methods to get your hands on cards in Arena
Berta, Wise Extrapolator Clement, the Worrywort Flubs, the Fool Genghis Frog Glarb, Calamity's Augur Gorma, the Gullet Grolnok, the Omnivore Helga, Skittish Seer Thalia and The Gitrog Monster The Gitrog Monster The Gitrog, Ravenous Ride Uurg, Spawn of Turg Venus, Torn Between Worlds Yargle and Multani Yargle, Glutton of Urborg
For 6 mana, you can probably play much better dragons like Lathliss, Dragon Queen, but Oros has a nifty triggered ability if it deals combat damage to an opponent
On paper, it looks like a decent replacement for a counterspell
The concept of owning a serialized card, however, will gradually become less special over time