Among these four, Terra, Herald of Hope looks to be the juiciest from a Commander perspective
The -1/-1 counters and +1/+1 counters cancel each other out in a 1:1 ratio as a state-based action

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I like Spelunking, though, as a means to get your lands into play untapped and even make an extra land drop
However, if there aren't any wizards that you can put in your deck or make use of, it's not really a tutor at all
Control decks have access to a similar answer in Firebending Lesson