The reason for that was that Rith, the Awakener came along at the most favorable time in history for a good, large finisher in its colors thanks to the rise of Fires of Yavimaya
If you search your deck for more than one card, you can replace each of those cards with an Omnipresent Impostor as long as there are enough Omnipresent Impostors in your deck
Other cards that made the Top 20 list I had included Prophet of Distortion, Ayli, Eternal Pilgrim, Crush of Tentacles, Call the Gatewatch, and Vile Redeemer
20 years down the line, Im still incredibly enthusiastic about completing sets, that sense of discovery never went away, while the majority of modern sets dont quite do the same for me I still enjoy them very much and having a community of people here who have wonderful and unique experiences with Pokemon really reinforces my love for the series