Unlike some other Prize Cards, this one was totally playable and might be part of the reason why it was so valued aside from its prize status
Since indestructible doesn't prevent damage, an indestructible planeswalker will still have loyalty counters removed if it's hit with a burn spell, and that planeswalker will die if it hits 0 loyalty
I wouldn't have an issue if you ran it against me in Pauper Commander since it's a one-of, but your milage may vary
The token copies exactly what was printed on the original creature and nothing else (unless that creature is copying something else or is a token
This strategy has a little added twinkle in FIN, with both The Emperor of Palamecia and Shantotto, Tactician Magician giving you added bonuses if you spend 4 or more mana to cast your noncreature spells
Bonescythe allows even two or three sliver to be hard to deal with, and going wide with double strikers is usually a good aggro strategy