with pressure, an impenetrable bulwark
You enchant it, bounce it back into your hand, and when it leaves the battlefield, the enchanted permanent is gone
Phyrexian Hydra I dont think Phyrexian Hydra was played in Constructed because decks with infect are usually more explosive and want lower drops
A lot of the creatures Id want to run are recursive creatures that come back from the graveyard and have low power, which makes them perfect for skulking past blockers, sifting through extra cards, and draining your opponents for life
Opportunities for really big card prices now come from special promotional cards and supplemental products released in smaller print runs outside of the regular card sets
The additional flexibility in being able to kill Planeswalkers and not just creatures pushes this option over the top