Pay 1 life, sacrifice a creature: not only do you weaken your adversaries with a -1/-1 counter, but you also draw a card
Normally, you'll be able to cast them only during your main phase while the stack is empty
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
Kamigawa: Neon Dynasty is no different, and it provides an assortment of powerful cards to tantalize all the blue mages out there
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
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