Following this idea, if you include Nemesis Mask in your deck, it forces all of your opponents' creatures to block Anti-Venom
In order to prevent the cards from covering every square inch of the floor in your kids room, you may want to set him up with a [easyazon_link identifier=B01BRGTWOA locale=US tag=maminthenow0e-20]binder[/easyazon_link] and [easyazon_link identifier=B005JCL05I locale=US tag=maminthenow0e-20]plastic sleeves[/easyazon_link], also to protect the cards
Purphoros, God of the Forge is another damage dealer in this vein, but is far more specific to token based strategies, with Terror able to slot into many more archetypes and provide meaningful removal to boot
Some of the best places to sell your Pokmon cards are: TCGplayer lets you individually list your cards for sale, or lets you set up a bulk lot if you want to make money off of your entire collection
And if you're a fan of Universes Beyond you may want to check out the newly announced Transformers cards