If you have 12 runes channeled at the beginning of your turn, do you skip drawing a card from your main deck?

Ruling: No, this is not true. You still draw a card from your main deck even if you have 12 runes channeled at the beginning of your turn.

Nuances:

• This misconception may arise from confusion with cards like Mobilize and Catalyst of Aeons
• The confusion may also stem from misunderstanding the restriction on channeling more runes when at 12 (which does exist)
• There are no priority windows during start of turn steps unless there is a trigger during the Beginning Phase