It has one of the most restrictive ward costs and also generates a lot of value for you with all its triggered abilities
Even though there are matchups where we want a ton of counters (like Izzet Epiphany and against various control decks), with nine counters in our sideboard, we couldn't find the room to bring them all in, even in the matchups where they are great
instead of focusing on the Doctors and their companions, this deck puts the villains of the Doctor Who universe front and center
Utility Lands Some of my Ninjas are also Rats, so Swarmyard is here to regenerate them and protect them from destroy effects and damage
Felhide Spiritbinder is a fantastic example of this, as it can create a nauseating amount of copies in the right deck
Even better, Acidic Slime has deathtouch, so it can block favorably, making it a great two-for-one