Lyse Hext
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) Noncreature spells you cast cost {1} less to cast. As long as you've cast two or more noncreature spells this turn, Lyse Hext has double strike.
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Official rulings (3) · Scryfall
Noncreature spells that were cast before Lyse Hext entered count. For example, if Lyse Hext enters on a turn where you've already cast two noncreature spells, she'll have double strike immediately.
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of Lyse Hext's second ability). The mana value of the spell is determined by only its mana cost, no matter what the total cost to cast that spell was.
The cost reduction applies only to generic mana in the total cost of noncreature spells you cast.