A three-mana combat trick is a big ask, but this will make a huge difference in a race, and because it cantrips, is going to slot nicely into the UB draw-two archetype.
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Mistfire Weaver is another one with a three mana morph cost and basically provides you a counterspell against targeted removal, and I think throwing one into the mix can stretch your opponents guessing game even further
GREEN Aggressive Mammoth Aggressive Mammoth is a new auto-include in the mighty Elephant Tribal archetype
Aaron called these Commands and made a rare cycle of them
Getting to put X creatures of the same type on the battlefield is huge for a 7-mana investment, but at the same time, you need to have a board, otherwise youre not getting enough from this green instant