mtg best doctor who cards spoilers reveal every Doctor and Companion A lot of official Magic

Creature Artifact - Golem Murderers (CTRL to add secondary) Protection Teferi's Protection Until your next turn, your life total can't change and you gain protection from everything

Stridehangar Automaton $13.92 Creating a 2/2 flier whenever you create an artifact token is pretty solid, and Stridehangar Automaton isnt restricted to once per turn, either

Emerald Chromicon is especially nasty because it forces your opponent to think twice before challenging your characters

It doesn't sound explosive, but it gives you a way to bypass the standard restriction on how many lands you can play per turn

Affinity An ability that reduces the cost of a spell depending on how many Equipment, Towns, orBirds you have in play

All of these things are strictly illegal