From the very beginning, spells that kill creatures have been more efficient than the creatures they're killing
Shinobi is the best card to punish players choosing not to block small or evasive creatures, especially if they havent seen any ninjutsu cards that game
Likewise, Smothering Tithe and Monologue Tax are superb Enchantments that help to ramp a white deck up, but if you dont have the cards to spend the Mana on, then youre still a sitting duck
To make sure that you always have more cards than your opponent either don't use many trainers or supporters or wait to evolve your Pokemon or have supporters or trainers in your deck that allow you to draw many cards
Because people like me, presumably, are a good slice of Wizards of the Coasts target demographic
I'm not sure if this is a good idea or not, but I think it's a good idea