In a Zaffai deck where you are routinely casting multiple spells per turn by the late game, the storm count when Thousand-Year Storm is in play becomes genuinely unhinged
According to EDHrec.com, Sylvan Library is in over 38 thousand decks, and 18% of 207162 decks that play green
and then I can pull it out of my graveyard later with my other cards
Add in additional equity with cycling combos with cards like Drake Haven, and we have a card draw spell that will see ample play in Standard
Ignoble Hierarch Aside from Skirk Prospector, there's another MTG goblin that excels at mana ramp - but its green colouration means it's not for goblin tribal decks
Alternatively, TCG Player pricing for presale sealed product is crashing, so I reckon we're seeing the usual price crash post-launch coming earlier