To be clear, this is a sorcery speed effect, but you have priority as soon as it resolves, and sacrificing a creature is a cost to activate the ability, so there's not much of a window for people to remove it before you can use it
The set is focusing on the original Avatar: The Last Airbender animated series and won't be touching anything from The Legend of Korra, though that's not to say something could release in the form of a Secret Lair or two
While we're playing Tergrid because the front side is so powerful in our deck, Tergrid's Lantern sometimes is an even better finisher, and having both Tergrid and its Lantern on the battlefield at once puts our opponent in a really difficult position where, if they discard cards to avoid taking damage to Tergrid's Lantern, we can steal them with Tergrid proper, but if they take the damage, we can quickly burn them out of the game
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In the mainline games, Mewtwo is often positioned as a post-game challenge, a testament to its legendary status