When Sharp-Eyed Rookie's ability tries to resolve, the other creature's power is greater, so you'll put a +1/+1 counter on Sharp-Eyed Rookie and investigate
Of course, it's not legal anywhere, though it works completely within black-border rules, so maybe a Rule 0 conversation can get you there
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Plus, if your deck runs fetch lands like [c]Evolving Wilds[/c], youll be able to trigger the Trackers ability twice in a single turn, creating two Clue tokens instead of one
It forces each opponent to sacrifice a non-land permanent when attacking, and gains 2 +1/+1 counters each time one of your artifacts enters the graveyard or exile from play
