This is one of the best among vision cards.
There is no other vc that bestows AGI+ on the whole party members even on the JP server yet.
AGI is very important stat both in PvP and PvE.
Note that however, during the event period (since it's a limited time vision card), you also have to acquire enough shard of it to perform limit break for bring out the best in it.
UR Units & Tier List
Upcoming Unit/Vision Card Release Schedule
EX Job Guide
UR Vision Cards
Helena (Black Witch)