There are three basic types of resources: Cards Mana Life Cards Cards is really a shorthand for raw materials, and it encompasses not only the cards you draw but also the permanents you have on the battlefield (including tokens) and anything impacting the game from another zone (such as your graveyard)
As one of Magic's best free spell, it's played just about everywhere it's available, being a free counterspell and all, and in colors where it wont be hard to draw into more blue cards
But this initial innovationtelling a short story via a single cardis the basis for all of Magics going forward
For example, a rarity distribution of 1:20 means that you will likely acquire 1 item of that rarity in 20 instances
Even when Decay is "bad," it still kills threatening things like Scavenging Ooze and Nightveil Specter
More people are going to find ways to use those cards than you think