you guys do realize this is an EDH deck, right?
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That's true, but if you give him +3/+3 he can get 3 more -1/-1 counters allowing him to untap. If joraga treespeaker is fully leveled then this allows you to create six more mana. With six mana you can do an elvish overrun again with 1 mana leftover - effectively netting 1 extra mana for every overrun an infinite number of times.