Can I have more than two different domain runes in my Rune Deck?

Ruling: In constructed format, you cannot have more than two different domain runes in your Rune Deck. In limited format, you can have three different domains.

Nuances:

• Even in limited format with three domains allowed, you cannot play Twisted Fate (purple) alongside all three colors required for his effects
• This means Twisted Fate cannot trigger his stun effect in constructed format