So yeah, The First Doctor is going to be a cascade deck, and if you like Planechase cards, you can planeswalk too
It gives all your creatures +1/+1, trample, and infect until end of turn
Enduring Innocence Cards like Mentor of the Meek always find their way into decks, and Enduring Innocence is no exception
Blinking, or more commonly flickering, is where you exile a creature only to bring it back immediately or at the end of the turn
This is a great combo for maintaing board control in the mid-game, and will help you keep your hand healthy while you stall out your opponent
Generally speaking, I try to focus on individually powerful cards in Limited rather than trying to assemble synergies like I would in Constructed