Historical Rules · 30 September 2016
Rule 702.36d
Official source text from the 30 September 2016 Rules release
You can’t normally cast a card face down. A morph ability allows you to do so.
Historical Rules · 30 September 2016
Official source text from the 30 September 2016 Rules release
You can’t normally cast a card face down. A morph ability allows you to do so.