If a Mountain you control leaves the battlefield between the time Valakut's second ability triggers and the time it resolves, be aware of whether that was the Mountain that caused Valakut's ability to trigger or not
Keep pumping out Rats, and youll have a massive army of these in no time
You can utilize Master Transmuters activated ability to return an artifact you control to its owners hand and put Valors Flagship onto the battlefield from your hand
Theyre very interesting to look at and make up in detail what they lack in color
Of course, the flipside is you could pay 3 life and get a mountain out of Mystic Peak
However, Mila, Crafty Companion lacked a home, and Lukka, Wayward Bonder is just an atrocious planeswalker for its cost