If you have two non-Hydra creatures with Wildwood Scourge's ability (perhaps because they were mutated using the Ikoria: Lair of Behemoths mutate ability), putting a +1/+1 counter on any non-Hydra creature you control will cause the two abilities to trigger each other indefinitely
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Consider Elrond, Master of Healing, Galadriel of Lothlrien, and Legolas, Counter of Kills
There are plenty of other playables worth mentioning, but I found that cards like Teferi's Protection, Swords to Plowshares, and Ephemerate are so unbelievably good at doing what they do that the third or fourth next best option isnt really even worth mentioning
This means they don't have to attack at all, but it still demands they are tapped and it forces your opponent to tap them on their turn