Power of Mind

When you cast Power of Mind,
create a token permanent named "Power Leyline"
with shroud, "this permanent can't leave the battlefield," and "at the beginning of your
upkeep, roll a D20: if 1-15, do nothing.
If 16-20, you may cast a copy of a spell
named 'Ancestral Recall,' 'Black Lotus,'
'Time Walk,' or 'Timetwister' until end of turn without paying its mana cost."