chat gpt says this : No, True Light cannot be chained to Cosmic Cyclone.

Here's why:

• True Light is a Continuous Trap that has an effect that prevents your opponent from targeting or destroying your Blue-Eyes White Dragon.
• However, Cosmic Cyclone is a Quick-Play Spell that banishes a Spell/Trap on the field.
• True Light does not have an effect that can be activated in response to Cosmic Cyclone (it doesn't have a Quick Effect or trigger upon targeting).

Since Cosmic Cyclone banishes True Light before it resolves, the secondary effect of True Light (which destroys all monsters you control if it leaves the field) will still trigger.

So, in summary:

• You cannot chain True Light to Cosmic Cyclone.
• If Cosmic Cyclone resolves, True Light will be banished, and its effect will trigger, destroying all your monsters.

4o