Speculation #7(prophet of kruphix)

This undervalued rare is amazing.It allows me to untap my land and creatures on your untap step as well as on mine.this means I can play my creatures on your end step and then on my turn they don't have summoning sickness.I can swing every turn and still have blockers on your opponents force of 1/1 prowess monks.The regular theros rare is about $1.50,But it should cap at about $7.50.but the promo should cap at $15 due to its shininess