One of my favourite Dungeon & Dragons race deserved to be transformed into MtG cards. I really focused on their name to create the gameplay I wanted them to fit in. Without any surprise, they are obviously Blue and Black. They share a racial mechanic which I named Mindflay.
The vanilla Illithid introduces us to their tribal mechanic: Mindflay. I made it so that the revealed cards would be random; otherwise the opponent would always reveal the same cards over and over.
Some Illithid have other abilities that trigger whenever a player reveals cards from his or her hand. It reinforces the synergy between them as a tribe.
I wanted to add Prowess to one of the Illithids because of its synergy with Mindflay.
This last little common can be very dangerous combined with other Illithids!
Discard, of course.
For those who like tokens and sac effects.
This guy enables other Illithid’s triggers very easily since he’s unblockable. I should maybe up its CMC to 2, but on its own it’s basically only a Merfolk Spy on crack (because two colors and randomness).
The mind control guy !
An instant-speed enabler for your Illithid triggered abilities.
Another spell that enables your Illithid triggers. Sorcery speed, or course, since it’s common..