This is our first, but not last, Grixis dork
The Fractured Foils are as rare as expected, the Leylines are caught between useless and broken, and the rest of us are just trying to keep up with the world-encompassing demon
We've got 14 cards that proliferate, letting us stack up the poison but also so much more in the deck
However, an ability that triggers "Whenever one or more creatures enter" would trigger once for each event
Plus, you get to exile artifacts, creatures, enchantments, and graveyards (or any combination thereof) rather than just destroying permanents and sending them to the graveyard with Austere Command
Last week Reid Duke used a Pioneer Indomitable Creativity deck to win Pro Tour Phyrexia