The basis for these monsters, "Vijam" is a teardrop-like creature (or seed if you will) with wings, a head fringe, and a singular emotionless eye
Therefore he goes around and defeats the best Duelists he could think of such as Greiger, Sherry, and Kalin
I figured he would be alright, but I found that he did better than that in the aggressive decks he fit into, providing a surprisingly decent threat at 5 mana to alpha strike out of nowhere
Though the mechanic isnt evergreen, echo has been printed in several sets over the years including Urzas Legacy and Urzas Destiny , Time Spiral , Future Sight , Planar Chaos , Modern Horizons and Modern Horizons 2 , as well as reprints across various Commander and Masters sets