Doubling Season says that you put double the counters whenever you would put counters on a permanent
Agent card, five random booster packs from previous sets, three card dividers, and a decorative box also with the alternate art
With new cards coming out all the time, you just never know
Superior Spider-Man 150% Superior Spider-Man was already the foundation of reanimator decks in Standard, so it being at the heart of Dimir Excruciator lists didn't impact its price as much as Insatiable Avarice or Harvester of Misery but a #1 spot in a Pro Tour sure didn't hurt: You could get a near-mint copy for about $2 last week, but it's over $5 now: Source: MTGStocks Twilight Diviner 150% Another Lorwyn Eclipsed card, but a no-show in the Pro Tour: Twilight Diviners spike seems more fueled by speculation than current usage or competitive results
Haste also gives Lava Serpent some protection from sorcery-speed removal, as I can already get an attack in with it before my opponents next turn
It was looking pretty sketchy for a while there until I drew into Mana Geyser