Theres a long, storied history behind the reserved list which includes potential legal repercussions if Wizards were to ever abolish the list and reprint the cards anyway
It's an effect that develops on the turn that uses the script, but by passing cards from EX through the hand, it can be expected to develop in large numbers like the P summons of the old rule
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Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Legal Toolbox Buy This Card Notes and Rules Information for Chandra's Ignition: The creature is the source of the damage, not Chandra's Ignition
Durable & Long-Lasting Withstand the most intense matches without splitting or fading
But, Shimon told Zarc that Exodia, too, was immortal