Conspiracy: Take the Crown also introduces some new mechanics
If an effect like Hardened Scales is an auto-include in these decks, a full-on counter-doubling effect is going to be a rather exciting prospect
I initially added a lot of colorless lands: Strip Mine and Wasteland to control nasty lands on the other side of the table, Winding Canyons for flash purposes, and more
It's extremely likely that your opponents will have some permanents with counters, and you can use those to build relationships and garner favors
Red spells (like Fireball) are known for dealing the most damage to opponents overall, so the Mox Ruby card can be invaluable for red spell users
You can put both triggers on the stack, then resolve Displacer Kitten's first, have it blink The Fourth Doctor, then trigger The Fourth Doctor and generate a Food Token