Originally Posted by
ivanpei
Contrary to popular belief, Elspeth is not great against delver. She needs double white and against a flying delver, she does nothing. Also simply blocking a goose/Goyf everyturn is underwhelming. Stoneblade is not very aggro, so her added damage is not too useful. She is only really good against other decks with Jace because she can kill jace.
Jace IMO is better as the 4th walker. He pitches to force against combo, extras can be brainstorm away, he bounces delvers/dudes and most importantly he draws cards. I've found that when I get an Elspeth to stick, she is not game. She chumps for a while then gets killed when they flood with dudes. Her + 3/+ 3 is also not very impressive because we are unlikely to win any damage race. Jace makes a much bigger splash.
Even if he gets killed, a few bounces/brainstorms can put you ahead indefinitely. Elspeth at best for me makes my batterskull a flying scary lifelinker, but often, she soaks a bunch of damage, then dies. Jace bounces and creates tempo. Then helps me draw into answers to control the game, and finally fateseals and ultis for the finishing touch.
My 2 cents.