Much like Counterbalance, the slow and steady climb of Greensleeves, Maro-Sorcerers price isnt entirely due to demand
If turning a face-down permanent face up causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time
Premodern and Legacy particularly benefit from this ruling, especially considering the rampant rise in Reserved List prices
Wren's Run Packmaster, meanwhile, gives you a mana dump for later in the game when you're producing more than you can use, and will allow you to generate Wolf tokens on your opponents' turns if you don't need to use your mana to respond to something
Waste Not is a poor topdeck too, and while its good with discard nukes like Rakdoss Return, those cards are backbreaking enough on their own