At

the

beginning

of

your

upkeep,

put

a

time

counter

on

this

enchantment.

Once

each

turn,

you

may

pay

rather

than

pay

the

mana

cost

for

a

spell

you

cast

with

mana

value

X

or

less,

where

X

is

the

number

of

time

counters

on

this

enchantment.