Sure, Divine Verdict can off an attacker, Judge Unworthy can scry, Doom Blade costs a bit less, and so forth, but for a simple 3 mana, these both are great removal choices for their colors
The original cards end up back on top of your library, similar to Brainstorm
They are all colorless because Mishras Workshop or Ancient Tomb is just too good and there are enough crazy ramp lands in the older formats to support a deck like that
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Green and red also have good ways to buff creatures, so you can play something like a Giant Growth on your creature before combat then double its power again