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They're not activated abilities of Mishra

Consider its card type, any effects that modify when you could cast it (such as flash) and any other effects that stop you from casting it (such as from Meddling Mage's ability) to determine if and when you can do this

(2022-10-07) If another player gains control of your graveyard, Animate Graveyard will be put its owner's graveyard

Countering a spell for 2 mana has always been a good rate, and then giving you the ability to stop a power play while effectively stealing the benefits of an opposing Dark Ritual, Black Lotus, and/or Moxen on your next turn was powerful Magic then, and it is certainly not worse now

Sorry to break it to you