If Alela is played in place of Tegwyll as the decks commander, her goad ability will lead to a more technical, social-focused game than Tegwylls power plays
Tetsuko Umezawa, Fugitive
You'll also note that the Death's Shadow list is only playing 17 lands, which is on the extreme low end for "normal" decks
Instead, it gives Prosper's controller an extra impulsive draw each turn
It forces your opponents to gaze longingly at the Thassas Oracle in their hands, cursing that their love is now forbidden by an overbearing society that would never understand, so theyll bide their time, protecting themselves from other threats while they wait for the removal spell that renders their game winnable again
Hearing its name reminds it of the agony it went through in Valgavoth's hands