In 2v2, can you cast cards without action or reaction cost on your teammate's turn?

Ruling: Yes, you can cast base speed spells (cards without action or reaction cost) on your teammate's turn at legal timing.

Nuances:

• Rule 312.1 (as of version 1.2) appears to contradict this, but this is likely a misalignment between rule iterations
• The intent is clear that base speed spells grant limited priority to cast on your teammate's turn
• The exact comprehensive rules mechanism may be refined in future versions