That'll backfire on legendary creatures, unless of course, they have a relevant enter-the-battlefield trigger
Rainbow Dash Rainbow Dash elevates into an incredibly quirky mana dork, and draws cards better than 80% of the red and white cards in existence thanks to triggering on five attacks
Stax Pieces Stax cards are very controversial, especially in casual pods, but the stax cards that made it onto the Commander ban list are particularly egregious
The number of Treasure tokens is also dripping with flavorwhen Smaug dies in The Hobbit (sorry, spoiler alert), Thorin Oakenshields company of thirteen Dwarves, plus Bilbo the burglar, split Smaugs treasure horde into fourteen shares
As far as I can see, there's no simple way to exclude the back faces of cards without excluding entire editions they appear in, or excluding their names one by one