You could use MTGNexus, which lets you make full sets instead of individual cards, and you can even publish the set to let others view it and give you feedback
And you can combine them Voltron or run him in Vehicles decks too
Also, with the printings of new removal spells which are heavily played, the format is not truly missing out on interaction to deal with a 2/1
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Moreover, both Horn Attack and Waterfall are normal, damage-dealing attacks with no additional effects ( e.g., some Pokmon have attacks that require the player to discard an energy card)
And choose spells that can take advantage of the latest sets