If you can make that 5 damage 10 damage, youre giving your team up to +9/+0 and trample, which can effectively be even more once those same creatures deal their own damage
It's one of the best exile payoffs, so you can fill your deck with Swords to Plowshares and peoples favorite white spell, Farewell
Broodguard Elite Everyone adores the X spell game winning mana-sinking dork

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Giving all your creatures trample is a great way to do extra damage, and Kodamas ramp ability allows you, the green player, to play bigger creatures more quickly
Plenty of rares and even uncommons outperform mythic rares in competitive play