Jadefire Conundrum

Precede (When you cast this spell, exile cards from
the top of your library until you exile a nonland card
that costs more. You may cast it without paying its
mana cost. Put the exiled cards on the bottom of your
library in a random order.)
Permanents that enter the battlefield this turn
gain cumulative upkeep {1}. (At the beginning of
your upkeep, put an age counter on this permanent,
then sacrifice it unless you pay its upkeep cost for each
age counter on it.)