So, the thing to remember here is that "face up" and "face down" are, rules-wise, *completely* separate statuses from "day side up" and "night side up".
If you manifest a Test Subject, it's a face down nameless, colorless 2/2 with no abilities. You can turn it face up for 1U, in which case it will be a Ludevic's Test Subject.
But when your Howlpack Alpha transforms into Mayor of Avabruck, it is changing from "night side up" to "day side up". Which is NOT "face down" to "face up", so things that trigger on turning a card face up -- like Secret Plans -- will not trigger.
1. If I manifest a Ludevic's Test Subject is it a 13/13 and can i turn it back for 1U
2. If my werewolf transforms back into it's human form (ie/ Mayor of Avabruck), do I draw a card with Secret Plans
If you manifest a Test Subject, it's a face down nameless, colorless 2/2 with no abilities. You can turn it face up for 1U, in which case it will be a Ludevic's Test Subject.
But when your Howlpack Alpha transforms into Mayor of Avabruck, it is changing from "night side up" to "day side up". Which is NOT "face down" to "face up", so things that trigger on turning a card face up -- like Secret Plans -- will not trigger.
----
Lightning Bolts don't kill creatures. State-based actions kill creatures.