Question about the Dark Signer event

[C.C. 折オリ枝 の 夫]

I'll keep it short.

I'm currently at 380000 points, and I had a few days break from the game.

Could I get to 860000 before the event ends? If yes, how?

Also, deck suggestions for the event would be nice, I'm currently using my Rose Garden deck as it can easily dish out some good Synchro.

[Tunnel Sharks Rule!!!]

You can, basically do assists that way you can spend 20 instead of 40 plus you will always get an assist opportunity, also get the Earthbound item so that way you can have an easy way to get Immortal to spawn instead of waiting

As for decks I suggest anything that can get a Synchro turn 1
here is a Dragunity deck that can also be used for Competititve

https://www.youtube.com/watch?v=CuCEB7ELcrA&t=207s

[76561198970611814]

You would need a lot of Vestiges. In two days time, I don't think it's possible unless you have a deck that can do an insane amount of damage.

[Sup3rNo7a]

Tyrant Burst Dragon is also really good for this. Pop a Black Rose out, Summon Tyrant Burst using Fang of Critius, and equip it to let your monster make 3 attacks each turn.

It's pretty inconsistent, but if I've managed to get Black Rose + Red-Eyes Sword + Tyrant Burst Dragon a few times and the damage output is insane. I'm talking around 15,000+ damage per attack with a triple-attacking Signer Dragon (because of the 3x damage boost). 30,000+ if you're in a Turbo Duel and use the "Double ATK" option.

Here's one of the duels I did it in, though I think these links only work on mobile. https://duellinks.konami.net/att/075ee317e23d0e6a8d313e585cccecd22fa9f4a05c