In a game where players are often looking for more ways to add cards to their hands, the double whammy that Heffalumps and Woozles offers can be a very useful one
In a fun bit of design, Ditto is able to use the attacks of any Basic Pokmon in your discard pile
Pidgeot ex has the Quick Search ability, which allows players to add any card from their deck to the hand, and this can often close out games if a player needs a copy of Boss's Orders to win the game or a copy of Iono to stall out the game so they can win on the following turn
The new Wreck-It Ralph characters Vanellope and Snowanna, for instance, have the rush ability to challenge opposing characters as soon as they are played, but dont have a huge benefit like the current Amethyst/Ruby decks do when potentially trading characters in this way, such as drawing when banished
I could see this combining well with the popular Sapphire/Steel Ramp deck that runs Cogsworth
Its important to note that Frank is not describing the ideal number of sources for a given set of spells, hes describing the minimum , by his definition