Since i think this board needs more Challenges I’ve decided to make a very simple one myself.
The challenge is very simple. Just go into practice mode with a deck that has Possessed Ursus and buff its attack as high as you can.
Screen cap your results and post them below. The guy with the highest attack Ursus wins. 
50,733,056 for a start. 
Would’ve went much bigger without the npc interrupting me. Fun challenge though!
Gotta try with a friend instead, to see at what amount of attack it explodes. 
1st. Very nice. The highest I’ve ever gotten was around 10mil.
2nd. Good idea calling it a challenge. (I’ve renamed the thread from [Game] to [Challenge])
edit: Go for it. Try it with a friend and post your results, I’d love to see how big it can get. But it won’t be qualified in the challenge (even though there isn’t any prize :P)
29,933,568 myself. If he hadn’t just placed that Wild Avenger I could have beaten the record.
Ruunin is definitely the best opponent to go against.
And I thought that my 64-attack ursus was quite something lol
I think Sharra is better (if you got Ursus + some buffs on your starting hand).
Also, I think I’ve broken it:
It went from:
1,634,043,392 to -1,026,880,512 to -2,053,761,024 and back to positive 187,445,248…
Not sure what exactly happened.
Now I wonder what would’ve happened, if I had the opportunity to attack anything with that negative attack number… 
Neat, that basically proves it: It’s being held in 32bits. So the theorectial maximum is 2,147,483,648 (which is 2^31), after which it starts counting up from -2,147,483,648.
… it might actually be a max of 2,147,483,647 I forget the exact details of how it aligns them.
