These cards are all overpowered and unbalanced or gamebreaking (clear proof of incompetence in the current design team):

Leyline of Resonance
Enduring Curiosity
Sheoldred, the Apocalypse
Kaito, Bane of Nightmares
Faerie Mastermind
Heartfire Hero
Manifold Mouse
Screaming Nemesis
Emberheart Challenger
Innkeeper's Talent
Questing Druid
Pawpatch Recruit
Mosswood Dreadknight
Preacher of the Schism
Urabrask's Forge
Overlord of the Floodpits
Overlord of the Hauntwoods
Overlord of the Mistmoors
Sunfall
Up the Beanstalk
Beza, the Bounding Spring
Enduring Innocence
Caretaker's Talent
Cavern of Souls
Shardmage's Rescue
Enduring Vitality
Stormchaser's Talent
Helping Hand
Recommission
Royal Treatment
Surge of Salvation
Scavenger's Talent
Unholy Annex/Ritual Chamber
Mirrex
Lunar Convocation
Authority of the Consuls
Chimil, the Inner Sun
Skrelv's hive
Kona, Rescue Beastie
Virtue of Persistence
Virtue of Loyalty
Case of the Locked Hothouse
Unstoppable Slasher
Case of the Crimson Pulse
Warleader's call
Hopeless Nightmare
This Town Ain't Big Enough
Fear of Isolation

As it is, standard is the worst it's ever been and these cards are part of the problem as they result in the format being 90%+ aggro or aggro/combo.