Blue decks usually have more cards in their other colors but still have significant blue mana needs since most of the best blue cards require two colored mana (Mana Drain, Braingeyser, Control Magic, Mahamoti Djinn), so mana balance can be a problem
Sure, you can use it as a one-of-mana ramp effect, sacrificing Sakura-Tribe Elder to go get a basic land, but it can be so much more
It targets an opponent, so you cannot target yourself (even if you despise yourself, you are still not an opponent to yourself) or your teammate, for instance in 2HG
The goal is to make fewer preventable mistakes than your opponent
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