I shouldn't go into deathmatch 25 with a 25 star deck, aka one allowed by the rules, and run into people using straight 5 star characters, fix the exploit that allows this to happen as it is gamebreaking

Well u could run 3 5 stars 5 stars it isn't worth the risk

You're probably clicking extended not extended 25.

3x 5 stars
5x 2 stars
= 8 cards, 25 stars

Or you can even try 1* and have
4x 5 stars
1x 2 stars
3x 1 stars

You can use 1*s? Never knew that.
still think was probably clicking extended.

I agree with the OP here, just jumped into "Deathmatch 25" (not extended 100%) and played a guy with three 5 stars and a 4 star back to back. Even if he did have one stars in the deck, it's highly unlikely that you get your best 4 cards back to back. I believe it's a problem with the link maybe; however there is an issue that needs to be addressed.

Probably the only problem is so few people play dm 25*, that you end up being in extended due to lack of players