Hearthpwn

Nope!

If no one manages to get it by the end of today, I'll reveal the answer. Until then, here's a final clue

Is it 3 damage you need?

Another copy of Archmage?

Just hope it's not Emerald Hive Queen

Or I may be a portal to rage

Molten Reflection ? Scratch that... Open the Waygate ?

Nope!

alright last guess then im lost again... Faceless Manipulator

aahh shit neverminnd i forgot there was older clues too

Quote from DestroyerR >>

Maybe Unstable Portal?

 Oh, it's 100% unstable portal.  

I looked quite unsuspecting at first   //A random minion doesn't seem like too much.

Although my upkeep cost is quite high  //That's the flavor text.

I’ve headlined Trolden many a time  //Because it has

Don’t confuse me for a glyph

Although my outcome can be primordial  //A reference to primordial glyph, a similar 2 mana card, that gets you another, discounted, card.

--

Although my number's look like twos and threes  //2 mana, 3 discount

It's actually 1/3 of the annual GDP  //Seriously, leaning super heavy on the flavor text here, like, seriously, check it out.

Entirely random and entirely broken  //Definitely entirely random.  Broken... Not sure exactly, maybe just because...

Gonna bring in Old Gods awoken  //Sometimes, you get the absolute bananas outcomes, and I'm not talking Mukla.

--

Is it 3 damage you need?  //That sure is a thing you might get from a minion

Another copy of Archmage?  //Yup, can do.

Just hope it's not Emerald Hive Queen  //An option, and certainly...

Or I may be a portal to rage  // ...a 1-mana card that makes your minions more expensive isn't exactly what you want.  Also portal.

You’re right! It is unstable portal. The upkeep cost is a flavor text reference. Your turn destroyer.

Azalina Soulthief ?

Madame Lazul

I’m late, I admit, since my call  //Am late, implies that the card is from the new expansion

was three expansions prior  //Three expansions prior should  probably be Witchwood, but could potentially be KnC or Boomsday.

but I’m the meme-iest of all  //A meme-y card?  Interesting

Since I give you your opponent’s desire  //A thief card?

Initially, this could be Togwaggle's scheme.  Potentially taking many copies of a card your opponent plays is kinda meme-y.  (Seriously, you could do some crazy stuff with that)  You could spin Heistbaron Togwaggle himself as this, too, since he gives you a fabulous treasure, but that's not something that your opponent specifically desires.

It feels like there's something that should go with 'my call,' but I'm not seeing any crazy demons that are coming back, or, for that matter, the old gods.

On net, I'll guess Togwaggle's scheme.

For similar reasons as JibbaNerbs said, I'll guess Dr. Boom's Scheme. I don't really feel like there is a card relating to Hagatha in any way whatsoever.

King Togwaggle?

Memiest of all, who could be memiest meme of the Hearthstone !?
and am could be also was. it is 3rd time they print;

77777

Dr.7

Blastmaster Boom

Renounce Darkness?

Wait, wait, wait.  Is it Archbishop Benedictus?

Voice line: 'My master will return,'  Master being somebody missing, (E.G. the Old Gods, whose expansion was 3 previous.)

Gives you your opponent's deck.

Also, 100% a meme.