Many cards in MTG get stronger when your opponent reaches a certain graveyard threshold
While this sounds counter-intuitive, it lines them right up to either be brought back to your hand or even outright win with a well-timed Gallifrey Stands
A lot of the Tyranids in this deck have X in their casting cost and come with a new keyword ability called ravenous. Ravenous has the same text as you see on tons of hydra creatures, saying that they enter the battlefield with X +1/+1 counters on them
Marcy: The irony is that in Gruul there aren't a lot of 2 mana cards that don't already have haste, so it feels like digging them up this way is just not cost effective
Whatever the case may be for you, here is the list of the top 10 most expensive Wilds of Eldraine Magic: The Gathering cards in the market
He does take 1 damage when an opponent plays a character, but its still immensely worth playing him, even if he only lasts 2 turns