The downside is there's more chance that you'll whiff, the upside is if you do find a threatening creature, it can attack instantly (as can the Wanderer itself)
(I should also mention that this doesn't include reprints, so fetch lands are counted as Zendikar cards, not Modern Horizons 2 cards, so they aren't skewing the data.) While Modern Horizons sets add a lot of interesting new cards to the Modern format, at this point, it's clear that they also add a lot of expensive cards into the Modern format, which in turn ends up increasing the cost of playing the format
once you decide to cast it, it immediately bolsters your team and often threatens lethal within a turn or two
These are 069/325, Vintage Masters , and rare, respectively
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Thus, the +1/+1 counter will boost its stats from 1/1 to 2/2