They're microbalancing URF like they did ARAM

Champions

Due to our extended testing window on PBE, we’ve been able to utilize a similar balancing approach to ARAM for URF, dialing in the approach specifically for the champions that really pop off. We’ve tried to make sure we adjusted champions in ways that do not hamper their classic URF patterns, while also not invalidating other champions as reasonable options. The changes below are the adjustments made from how each champ normally is on Summoner's Rift. 

    AATROX +25% damage dealt & -25% damage taken
    AHRI -8% damage dealt
    AKALI +15% damage dealt
    ALISTAR +5% damage dealt & -10% damage taken
    ANIVIA +15% damage dealt & -10% damage taken
    AURELION SOL +10% damage dealt & -10% damage taken
    BARD +20% damage dealt & -10% damage taken
    BRAUM +10% damage dealt & -25% damage taken
    CAMILLE +10% damage dealt & -10% damage taken
    CASSIOPEIA -22% damage dealt
    CORKI +10% damage dealt
    DARIUS +10% damage dealt & -10% damage taken
    DIANA -5% damage dealt
    ELISE +10% damage dealt & -10% damage taken
    EVELYNN +20% damage dealt
    FIZZ -5% damage dealt
    GANGPLANK +15% damage dealt
    GAREN Eliminated the ability to stack spin casts & -10% damage taken
    GNAR +10% damage dealt & -10% damage taken
    HEIMERDINGER -10% damage dealt
    ILLAOI +5% damage dealt
    IRELIA +5% damage dealt & -10% damage taken
    IVERN +10% damage dealt & -15% damage taken
    JANNA -8% shield strength
    JAYCE -5% damage dealt
    JHIN +20% damage dealt
    KAI'SA -5% damage dealt
    KALISTA +20% damage dealt
    KARTHUS -15% damage dealt
    KASSADIN +5% damage dealt & -10% damage taken
    KATARINA +15% damage dealt & -10% damage taken
    KAYLE -5% damage dealt & -10% damage taken
    LEBLANC +10% damage dealt
    LEE SIN +5% damage dealt & -5% damage taken
    LEONA -3% damage dealt
    MALPHITE -5% damage dealt
    MALZAHAR -15% damage dealt
    MAOKAI -5% damage dealt
    MASTER YI -10% healing & -10% damage dealt
    MORGANA -8% damage dealt
    NOCTURNE -5% damage dealt
    NUNU -5% damage taken
    ORNN +10% damage dealt & -25% damage taken
    PYKE -10% healing
    QIYANA +5% damage dealt & -10% damage taken
    QUINN +15% damage dealt
    RAKAN -10% shield strength
    RAMMUS +10% damage dealt & -10% damage taken
    RIVEN -10% damage taken
    RUMBLE -10% damage dealt & -10% shield strength
    RYZE +2% damage dealt & -5% damage taken
    SEJUANI -10% damage taken
    SHACO -12% damage dealt
    SONA -5% damage dealt & -5% healing & -5% shield strength
    SYLAS -5% damage taken
    SYNDRA -5% damage dealt
    TAHM KENCH +25% damage dealt & -25% damage taken & +10% healing
    TALIYAH +15% damage dealt
    TALON -5% damage dealt
    TEEMO -5% damage dealt
    THRESH +10% damage dealt & -10% damage taken
    UDYR +10% damage dealt & -15% damage taken
    VEIGAR -5% damage dealt
    VEL'KOZ -5% damage dealt
    VLADIMIR -8% damage dealt
    WUKONG -5% damage dealt
    XAYAH -12% damage dealt
    YORICK -10% damage taken
    ZAC -15% damage taken
    ZED -10% damage dealt
    ZILEAN +20% damage dealt
    ZOE +10% damage dealt  

[zombie-brand-facepalm]

Also, Riot do you play your own game? EVELYNN +20% damage dealt??

EVE DOES INSANE DAMAGE IN URF, I literally 1shot people in half a second.