If Boggart Mischief is put into a graveyard from the battlefield at the same time as one or more Goblin creatures you control die, its last ability will trigger for each of those Goblin creatures
Alternatively, you could ignore all this: there's plenty in this package to make an effective stand-alone board game that is never expanded
The kid copy has the same name, creature type, mana value, and all abilities of the parent creature
Plenty of cards can also turn Basalt Monolith into an infinite mana engine, notably Zirda, the Dawnwaker and Kinnan, Bonder Prodigy
Another variant, and the one that's more relevant here, jams in as many 0-cost artifacts as possible and plays Weapons Manufacturing, spitting out a load of Munitions tokens
In any casual metagame, you will find a number of planeswalkers, and this is especially effective against Commander decks where players could have 6 or 8 planeswalkers in their deck without even trying