A Nashor's-Shadowflame-Rabadon's burst build is popular in high ELO NA, effective when your team lacks a main dealer or against many ranged enemies.
Consider Lich Bane over Nashor's against squishies; Rabadon's is more efficient when there are fewer tanks.
Avoid Shadowflame/Morello against tanks. Gwen maintains strong late-game carry potential, even when behind.
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