If I play Find your Center and don't have runes available to channel, do I draw 2 cards (one for the card draw effect and one for failing to channel)?

Ruling: No, you only draw 1 card. If you can't channel a rune because you don't have any more runes in your rune deck, you simply do not channel them and do not get an additional card draw for that.

Nuances:

• Some specific spells/abilities explicitly allow you to draw a card if you can't channel a rune (like Catalyst of Eons), but only those effects work that way
• Cards that let you draw when you can't channel will say so explicitly