Rivals of Ixalan Sheet Discovered Exclusive Unstable Preview
Notably, you get this trigger on the cast, so if you happen to have open mana and you manage to draw a counterspell or perhaps dont have open mana and draw one of the most valuable cards from Prophecy , Foil you can immediately cast it in response to the spell thats targeting you or your stuff
Phyrexian Obliterator is mostly played in the Commander format and some Standard decks like Mono-Black and Golgari Midrange
Using labeled A to Z card sorters, I would organize each card by the second and possibly the third letter
Unaffected by your opponents activated effects, unless they target this card
Froslass GL also wouldnt be a bad start with his dragging out and putting to sleep Sleep Inducer attack, but unless you have Darkrai G also out, you are not going to be doing any damage