Your hand, graveyard, and library are still very much in the game (more on that later) and these cards will work as normal because you arent protected from effects such as these
Although the creature card you put onto the battlefield is an attacking creature, it was never declared as an attacking creature
If you are fortunate enough to cast a Fumigate on a board with thirteen of your opponent's creatures, that's a thirteen-for-one
That said, since all of the worse-condition and cheaper copies have been bought out, its hard not to spend a good chunk of money right now
It's of course inevitable eventually, but I want to at least implement the ability to maintain save data before I update it again
Be sure to check back, as we'll be sharing more details about this upcoming MTG set as soon as they come to light