I know you said you don't like cosmic power but this is my take on it, flawed down to be less immediately useful. Also Power Permission "Power Theme Mage" would be appropriate for this. Or even better "One Power".

Spellbook 6/Die 7d3wd [114 pts]

Attacks [N/A] Defends [N/A] Useful [N/A]

Attacks Extras and Flaws: Duration +2, If/Then -1, If/Then -1, Variable Effect +4, Delayed Effect -2, Focus -1, Accessible -1, Operational Skill +0

Defends Extras and Flaws: Duration +2, If/Then -1, If/Then -1, Variable Effect +4, Delayed Effect -2 Focus -1, Accessible -1, Operational Skill +0

Useful Extras and Flaws: Duration +2, If/Then -1, If/Then -1, Variable Effect +4, Delayed Effect -2, Focus -1, Accessible -1, Operational Skill +0

Spellbook can be used to transfer dice from it's qualities to produce magical effects. There are 7 dice and 3 Wiggle dice to use for any number of effects that use the dice from this power.

He must spend each turn of the delayed effect studying his spellbook so he cannot activate the spellbook power and then do other things while waiting for the powers to manifest. He must study the spell book for the full time required for the powers to become available.

If/Then Wiggle Dice turn into regular dice when added to Stats or Skills

If/Then Must spend action reading every turn till powers manifest.

Operational Skill Knowledge Arcana

Technically you can drop another If/Than on each quality of "Only for Variable Effect"

Also buy a lot of base will to fuel extras.

SAMPLE POWERS

Magic Missle 3d1wd

Attacks Range

Extras and Flaws: Depleted -1, Go First +1

Magic Missle Barrage 7d3wd

Attacks[Range]

Extras and Flaws: Depleted -1, Go First +1

Mage Armor 2wd

Defends [Self]

Duration +2, One Use -4, Interference +3, Armored Defense -2, Go First +1

Fireball 4d3wd

Attack[Range]

Extras and Flaws: Radius +4, One Use -4, Burn +2, Obvious -1, Scattered Damage -1, Full Power Only -1, Reduced Capacities -1, Area +2