Mountain (Full-Art Pizza Land)
Pair it with some artifact cost reducers and cards like Sai, Master Thopterist that reward you for casting artifacts each turn, and this could work as a low-power value engine
Given that, I wanted to start with these enemy color combos before moving into the powerhouses of gold in the last three colors
Lethal Scheme is by and large a free spell, and we know how powerful those can be
You can get around this by running plenty of free instant speed sacrifice effects, which is pretty easy since black is loaded to the brim with these types of effects
Each round, make sure to add another Energy to Celebi ex so that you get another two coinflips, adding an extra 100 damage to the hypothetical total every round: eventually, the odds will just be so crazily in your favour that theres very little your opponent can do about it