Meltdown sees regular Modern and Legacy play as an answer to artifact-heavy decks like Affinity, and Rampage is better in a lot of situations, as long as you can afford to pay the mana
A powerful effect, this proved devastating in a Standard environment that included the Eldrazi of the Battle For Zendikar and Shadows Over Innistrad
In other words, everyone knows if a spell was kicked while it's still on the stack
Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to Fiend Artisan may become lethal if creature cards leave your graveyard during that turn
So hey, use it at your own peril
He talks about all this and more on his YouTube and TikTok channel, Just For Fun