number of card types mtg Designer Gives Hope For Obscure Un-Set Creature How to Organize Magic Cards:

When Born of the Gods design started up, Ken looked back through all the cards that had been cut from Theros

does this, while removing the opportunity for the opponent to react by proliferating counters or casting protection

All of these see quite a lot of play

Pirated Copy Clones that interact with the copied creature are fascinating bits of tech

Its not particularly impressive and may not even make the cut in this day and age of powerful pirates, but its no slouch either way

The sole reason for this not being higher up is because there is always someone at my table yelling, You activated my trap card! Its funny the first time, and makes me pull my hair out the fifteenth (if I had hair)