It's also nice when an equipment card creates a creature and attaches itself to it, so you don't have to spend extra mana to equip it to an existing creature, and you can still play it effectively if your board is empty
As the ability resolves, you create copies of both cards and can cast none, one, or both of the copies in any order
E.g., you could have a red box with the black texture to show a red/black deck design
That makes Maskwood Nexus, which can make all your creatures into Lhurgoyfs, one of the most valuable cards in the precon
It would be easy to add many more cards to this tier, but I have deliberately aimed to be selective here in order to show off the cards I actually think are strong, rather than cards that will see play as a 1-of or in some fringe deck