Including Blue, Red and Green, this combination is named after Tarkir, where the Temur frontier was known for using the wild brutality Red and Green offer, but in a more complex way, thanks to Blue
(If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.) When Polukranos, World Eater becomes monstrous, it deals X damage divided as you choose among any number of target creatures your opponents control
Having 40 cards in your main deck is also very effective in most kinds of duels, although adding a handful of other cards is also a good step
Seeing the extra cards is the icing on the cake
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The Broodmoth brings Boromir back, but Solemnity stops the flying counter, and lets you activate Boromir again