Broadly, there are two types of counterspells in Magic: hard and soft. Hard counters stop spells in their tracks without any restrictions, while soft spells either only stop the spell temporarily, or have an option to bypass the counter
If you don't know about Timmy/Johnny/Spike read this and this
Nearly all modern cards do, though a small number of very early Japanese releases predate the standardized symbol system
You must choose two different letters
Custom trading cards, for independent games or projects, are predominantly manufactured by specialized companies, mainly located in China, particularly in Guangdong and Zhejiang provinces
More cards with the ability show up in the Commander section and Jumpstart section later in this article