It's mostly the glitch (which will be fixed next patch) that now your Q applies luden's echo.
It's not a glitch. Runeglaive CONVERTS your next attack into magic damage, key word is convert. Since ez's Q normally does physical damage, it doesn't proc luden's or rylai's or stuff like that. But since Q also has on-hit effects runeglaive converts the physical into magic damage, procing luden's echo. So yeah it's not a bug
https://www.reddit.com/r/leagueoflegends/comments/3bwv14/runeglaive_no_longer_procs_ludens_on_pbe/csqfc0f
Yeah I don't see the barrels being very effective.
Support Vi because why the forget not.
ADC GP because it's no loving joke to take 1.8k damage in 1 Q.