Invasion of Kaladesh C-Tier: Two mana to make a 1/1 Thopter is about one mana too much, and while the backside is a potentially powerful Vehicle, you really need to be a heavy artifact deck to take advantage of it
Quite arguably the most dominant black card of all time
With Muraganda Petroglyphs on the battlefield your equipped bear will be 4/4 and unblockable
Since Wakka can only destroy artifacts, the Liquimetal duo lets us turn any permanent into an artifact - so we can start blowing up planeswalkers, commanders, or even lands in Coating's case
This means a permanent with that creature type, be it a creature or a kindred, but not a spell
(By the way, for those that care if they're playing this card as it's technically supposed to be played, this ability only works when you legally draw it to your hand.) Because we wanted to encourage you to sneak the card into play, we made it a little pricy to cast