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
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
If youre looking to expand your collection, you should definitely get one of them
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Its the best route if youre patient and want to maximize profit
imagine redirecting a Crackle with Power and draw ten cards