I rank a free Repulse over a free Boomerang since card flow is so important at the kitchen table, but they are pretty close in my mind
Chalice on one is devastating for decks like Murktide, Hammertime, Deaths Shadow or Burn, while Chalice on zero turns off any Cascade shenanigans as well as a quick start from an affinity list
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A lot of cheap white removal cards are temporary, only taking cards out of play until the removal itself is removed, like Seam Rip, which can also only target nonland permanents that cost two mana or less
I mean, easily and reliably hardcountering before youve ever taken a turn
The deck needs cheap interaction on turn one and two