When Urza started research on time travels, he found out that following temporal stresses will kill any creature having a natural body — even that of planeswalker.
Does this mean that Sharkan can't travel back? Or will he have to find a round-about way to get there? Or will WOTC remove this idea from the cannon entirely?
We saw many time-shifted characters in Time Spiral (like Mishra) without them suffering harm, and they certainly weren't made of silver.
So my best guess is that silver is needed only to Urza's "travel through the time streams" method. Sarkhan will go back using a different method, with it own rules and logic.
I guess the best analogy would be that Urza talks about putting something into the time streams and let it "swim" upstream, while Sarkhan uses a vessel to travel through time (Ugin's Nexus) which is more like using a boat. The analogy isn't perfect, but Sarkhan does not travel through time by itself, but has to use a fixed location and a certain object to do it. I suppose there are different laws for the different techniques of traveling through time.
Perhaps ugin pulled off a Thanatos Gambit [tvtropes term] and allowed his dead body to serve as a vessal and his voice/echos as a guide (perhaps as a hope of coming ack)
Although this does bear some suspicious similarities to flamewar starting narrative or hopefully I am just over thinking it.
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When Urza started research on time travels, he found out that following temporal stresses will kill any creature having a natural body — even that of planeswalker.
Does this mean that Sharkan can't travel back? Or will he have to find a round-about way to get there? Or will WOTC remove this idea from the cannon entirely?
(here's the link http://mtgsalvation.gamepedia.com/Time_stream)
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So my best guess is that silver is needed only to Urza's "travel through the time streams" method. Sarkhan will go back using a different method, with it own rules and logic.
Although this does bear some suspicious similarities to flamewar starting narrative or hopefully I am just over thinking it.