Syndra Tips needed.

How you counter syndra with mages? Syndra counters Leblanc,Swain,Ryze,Casseo and people say oriana too although i didnt play that matchup yet. So which mage counters syndra? Azir,velcoz,Xerath? But i dont wanna sit back and wait for scaling or just poke. Suggestion? (pls dont give jungler matchup suggestion...i cant tell my jungler what to pick)
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