A: Yes, and yes. Erayo is essentially asking the game if each spell is the fourth spell. When the game says yes, Erayo flips out. Erayo doesn't mind if some of the spells were before his time as long as they were that turn.
*Extra*: Be careful though. Erayo will not flip if Erayo itself is the fourth spell or if the fourth spell was played before Erayo arrived. For example, if you played the Mox, then played both Ornithopters, and then played Erayo, the Ascendant wouldn't have been in play to see spell #4. And another spell that turn would be at least #5.
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