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
(2) to apply any proceeds of sale of other Lots due or in future becoming due to you towards the settlement of the total amount due and to exercise a lien (that is a right to retain possession of) any of your property in our possession for any purpose until the debt due is satisfied
But from the outside, seeing players with enormous decks of cards, built over several years of collecting, along with trying to follow the rules of the game, can force players to shy away from picking up a few booster packs or starter decks
When legends was released, all legends were put on the restricted list
For controlling strategies, white and black tend to be good colors to pair with it
Yes, Mega Evolution cards are valuable due to collector demand, nostalgia from the XY era, and limited availability, with certain iconic Pokmon and Secret Rare versions commanding significantly higher prices