These can't be coded without changing almost every card out there. Theoretically, they could be made, but would require all cards to make use of an ObjectDC and check that for any colour/basic land/creature type changes. As such these are not feasible to create within the DotP engine. Even then to "change text" would require that an ability be created for each of the possible texts (for creature type that would mean more than 200 abilities for each applicable ability on a card).
Even a simple card like
Shanodin Dryads would require at least 6 abilities to support
Mind Bend. For a card like
Blade Splicer to support
Artificial Evolution would require
Blade Splicer to have more than 400 abilities plus require the creation of more than 200 additional tokens (one for each creature type).
I can't necessarily speak for other modders, but I can guarantee that I'm not going to go through all that work for a single card.