McDonald's has long capitalized on the success of the Pokmon franchise by releasing collectibles in their Happy Meals, including gold-plated metal cards, toys, and, most famously, cards from the Pokmon Trading Card Game
Hate and You Welcome to Hate Cards in Modern, where we teach you how to be hateful colour by colour
Blues MDFCs are also useful effects
Considering the Bridge Keeper asks King Arthur his favourite colour, having a five-colour card like this is a great bit of flavouring
To me only two pure life gain cards still feel like they are good stuff when you see them
Since creatures matter so much for this mechanic, cards that remove permanents or otherwise impact the board tend to rank higher than those that don't, though the Court cycles are very strong since they play well with board wipes