Whatve you got to lose? Tobias, trader of Erdwal Illustrated by Drew Baker Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp
Combo-wise, the Breach lines this deck attempts are identical to those seen in cEDH, so Shadow should be just as relevant here
This is taken a step further by the "Ragnaraika" archetype, mixing in Reptiles to form a trio
Even with the 50% more effect than Sleight you will find that Adventurous Impulse is less good sooner than the maths would suggest (ie when your deck is a third non-creature, non-land cards)
Rare cards are not much different from commons
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