The following cards appear in red in deck builder when deck format set to "standard":
Shivan Reef (M15)
Battlefield Forge (M15)
Negate (M15)
I've gone into the card detail screen and looked through the list of "legalities", looks like "standard" is missing.
Version and device details:
iMtG II 5.4.0 rev 103
iPhone 5s
iOS 8.0