It's like a double Duress but random, so it can hit anything, including lands
Since many of these abilities make the animated land into 0/0s with +1/+1 counters, cards like Hardened Scales, Shalai and Hallar, and Kami of Whispered Hopes that synergize with the counters can play well with these cards
Thats an interesting feature
While it will be hard for this set to be even as epic as the Pokemon expansion that it very nearly shares a name with, so far the products and cards revealed in this set are looking pretty exciting
Whether they succeed in taming the beasts when they hatch remains to be seen
It offers a lot more card quality than Sylvan Library and also some graveyard synergies but as it does nothing else, is always card disadvantage and is three colours so it has not seen any play yet