They have low cost so that you can flood the board early and attack your opponent directly
As a huge fan of villainy, I take great delight in watching my opponent making hard decisions, but we decided to drop that direction
Anyway, one of my most beloved EDH decks of all time is The Gitrog Monster
Don't forget to take what you've learned out to your local game store for Phyrexia: All Will Be One events, too, to get that analog experience of opening packs, finding amazing cards, and having fun tapping and casting across from someone who could be your next friend.
It can be used when the opponent wants to go for a lethal kill by saving your creatures and using this spell while also developing your board
There are six puzzles, one for each ink color