Quote from The Fluff »Path to Exile, Worship, and Rest in Peace. Some good modern playable cards in Gideon's Spell Book. If the msrp is going to be 20$, then those three cards combined already more than 20$.. which means the rest of the cards are FREE.
The rest in peace art does look like he was able to planeswalk to Theros.
Looks like he wanted to go back to the place where he was born.
Plot twist: With his last breath he planeswalked to Theros, died there, and is now tagging along with Elspeth in the underworld...