Normally, you'll be able to cast them only during your main phase while the stack is empty
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
Pay 1 life, sacrifice a creature: not only do you weaken your adversaries with a -1/-1 counter, but you also draw a card
Premodern and Legacy particularly benefit from this ruling, especially considering the rampant rise in Reserved List prices
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