Annoy-o-Mom
4
Battlecry: Stealth until your next turn.
At the end of your turn, summon an Annoy-o-Tron
1/3
Druid would abuse this card as would Paladin in Aggressive decks. Not to mention some of the other mech decks.
Annoyotron is supposed to be an anti aggro card but it's only used in aggressive decks because it is annoying to remove for control decks and it protects more important minions.
There are very few dedicated anti aggro cards in the game post classic set:
Unstable Ghoul: Whirlwind effect being symmetrical means that it's bad in aggressive decks. Same for the 1 attack.
Deathlord: Huge taunt, low attack and summons a minion from their deck. Only really used in Priest and Fatigue decks though. And these days the aggro decks can easily break the 8 HP to get another body on their side.
Zombie Chow: Until TGT this used to be played in Control decks to counter aggro, now Secret Paladins run it so they can have Dr.1 as well (as if Secret Keeper wasn't enough for them).
Dreadscale: Hunter only that really should've been a neutral Legendary.
Explosive Sheep: Basically Mage only anti aggro card.
Abomination: It's an anti aggro card but it's too slow and more importantly it damages own face.
Sludge Belcher: Two taunts for price of one.
Refreshment Vendor: Decent heal, ok body.
Tournament Medic: Most aggro decks don't in fact have many 1 health creatures. Without a taunt this is just going to get ignored on the board while you get tempo'd out.
Healbot: GG heal but these days even this is starting to be too slow. Putting this down on turn 5 while your opponent plays MC next means you already lost.
Bolf Ramshield: It's like a 3rd Healbot for decks that need. Problem.is that it's 6 mana and it can be silenced so you essentially lose 9+ HP if that happens.
Lil Exorcist: Usually it's too little too late.
Twilight Guardian: Very specific for dragon decks.
Chillmaw: It's very late game but this effect on a cheaper minion would be a very powerful anti aggro card. Also it's dragon specific.
As you can see all the good anti aggro cards were introduced in Naxx and almost nothing since then. TGT gave us expensive as fuck anti aggro cards that no one has time for. Oh and they gave us Jousting cards... LOL!