If I'm running Master Yi Legend Wuju Master, could I use spells that have Pay: Calm OR Order?

No, you cannot use spells that require Order power with Master Yi, Wuju Master.

Master Yi, Wuju Master has domain Calm/Body, so your deck's domain identity is Calm/Body (Rules 103.1.b, 175.1). Your Main Deck and Rune Deck can only contain cards whose domains are fully within Calm and Body.

Here's what that means:

• Calm spells (like Yi, Meditative or Master Yi, Unstoppable) — yes, you can include and play them
• Body spells — yes
• Calm/Body spells (Alpha Strike, Highlander) — yes
• Order spells — no. Order is not in your domain identity, so you can't put them in your deck, and you can't produce Order power since your Rune Deck only has Calm and Body runes