Thats probably why we only see Meltdown in 3,794 decks, not even registering as a percentage point in number of decks that can play it
Noxious Gearhulk and Patron of the Vein fulfill similar roles, and are much stronger cards, providing decent damage, evasion, and secondary effects
A very good one against decks winning through combat is Asinine Antics , which can also be cast at instant speed to turn all of your opponents' creatures into 1/1s
The owner of target permanent shuffles it into their library, then reveals the top card of their library
Im sure there will be plenty so one should not become too reckless in speculation
One of everything from Jumpstart , Commander Legends , Double Masters , and all the Standard sets