In Magic: The Gathering, a foil card is a special version of a regular card that has a reflective, shiny finish
The creature can still attack or block, but by all means, it won't be nearly as potent at that either, due to the power debuff from this card
For example, running a commander like Niv-Mizzet, Parun highly encourages the use of multiple cheap card draw effects to ping as many targets as possibleand, of course, win games out of nowhere when paired with Curiosity
[226] They later released an expansion Battle for Zendikar featuring multi-color Planeswalkers Kiora and Ob Nixilis and a colorless Eldrazi Ruiner, and a second master set Shadows Over Innistrad which has 4 new Planeswalkers and also includes the addition of cryptoliths
Rosewater doesnt confirm anything in his response here, but usually his answers like this do end up panning out