A lot of artifact strategies rely on cheap artifacts to get rolling, so playing Meltdown for 2 mana and wiping out multiple cards on an opposing player's board is very reasonable, sometimes bordering on game-winning
Its powerful in EDH where you can swipe game-enders like Ruinous Ultimatum and Breach the Multiverse
TCGPlayer is currently listing these for as low as $175.99 at the time of writing, while Amazon has a steeper price point of $189.99
The beginning player, though, doesn't tend to think of the death trigger as a result of blocking, so the idea that you could combine the creature damage with the death trigger effect never occurs to him or her
This is a reasonable threat and very potent in a token style deck
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