For example, say you've cast two spells this turn, and with Murmuration's last ability on the stack, you cast a Blizzard Strix (a Bird creature spell with flash that may have been chosen for this example due to being an adorable owl)

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If the deck is driven by a single powerful card, that card name might be used here instead
This will work nicely not just in Commander, but also in Modern Humans decks provided you can find ways to be tempted by the Ring each turn
2017-09-29 The mana value of a split card, such as cards with aftermath from the Amonkhet block, is based on the combined mana cost of its two halves