Saproling Infestation is the first creature token trigger based on the use of a mechanic (in this case, kicker)
The Sagas should only have two different chapter abilities
Honorable Mention Rankle's Prank This fun four-cost sorcery will make everyone you too discard two, and if you want lose four life and then Barter in Blood too, and any combo of those too
For the longest time (basically until Counterspell was printed in Modern), Thoughtseize, and to a lesser extent Inquisition of Kozilek, were the only major universal disruption spells in Modern
Chris Mooney and Ari Zirulnik assembled lists of characters from every game and split them up into tiers of mandatory, suggested, possible, and backup
Couple this with the ablity to move all damage and potentially send a character to the discard pile, and it's easy to see why it's so valuable