What do you mean the Storm King steal Lord Tirek’s evil plan?! Both Tirek and the Storm King are power-hungry conquerors who despised ponies and friendship in general, once trusted a certain individual until the were betrayed by said individuals due to their behavior, have the power to steal Magic from others, seek to take the power of the Alicorn princesses to become all-powerful, easily managed to capture Princesses Celestia, Luna, and Cadance, convinced a powerful individual to be their ally by promising them something to return, but then betrayed them when they were no longer useful, leading to their redemption, annoyed by the existence of Princess Twilight Sparkle and had to struggle with her while they reach into his staff, and in the end, both of them were defeated due to the interference of the very allies they betrayed, who was just previously saved by Twilight Sparkle. But unfortunately, Lord Tirek was re-imprisoned back to Tartarus and the Storm King died. However, Tirek was not much heinous as the Storm King due to having more redeeming qualities than him. Look it up at the Villains Wiki about the Storm King on the Trivia slot.

Storm King: “You didn’t trademark it.”

Storm King: Uuhhhh, I can explain!

T:“I’M LORD TIREK AND I’M HERE TO STOLE YOUR POWER”  
SK:“WHAT!!”

Was Tirek gonna build an army as big as the Storm King’s and conquer/destroy as many lands as the Storm King did?

@Mildgyth  
“Some creatures just want to watch the world burn”.

@northern haste  
If you are looking at the series as a whole. I mean, pretty much nothing was outwardly stated in the S9 opener. Sombra could kinda be anything.

@TheSultanAkbar  
also sombra’s comic did tie into his reformation in the main series So the canonicity of Fiendship is questionable

@northern haste  
Kind of… that was the Sirens issue… whatever, I guess, it jad nothing to do with Tirek and no one ever mentioned his backstory

@TheSultanAkbar  
it’s been a while since I’ve read them also as I’ve been recall shadowplay directly contradicted issue 5 of them

@northern haste  
His Fiendship comic book (if you read it/considered it)

@TheSultanAkbar  
I don’t recall them saying anything like that

@northern haste  
Isn’t he from some faraway land like his brother? Destroy Equestria, create building foundations for his part?

@northern haste
 
Destroy everything.
 

what Exactly was tirek plan again? ok he want to steal all the Magic Equestria. why did he want it all what is he going to do afterwards?

No. Storm King has a brand. He’s just a businessman looking for an expantion opportunity.