Murmuration
Birds you control get +1/+1 and have vigilance. At the beginning of your end step, for each spell you've cast this turn, create a 1/2 blue Bird creature token with flying named Storm Crow.
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Official rulings (2) · Scryfall
Murmuration's last ability counts spells you cast earlier in the turn even if you didn't control Murmuration as you cast them and even if those spells were countered or otherwise didn't resolve.
The number of spells you've cast is counted only as Murmuration's last ability resolves. 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). When Murmuration's ability resolves, you'll have cast three spells so far this turn, so you'll create three Storm Crow tokens. Caw!