Card Text 2 [Inherited Effect] When effects trash this card from a [Mineral] or [Rock] trait Digimon's digivolution cards, delete 1 of your opponent's Digimon with a play cost of 4 or less
If the trade is a little uneven, it's always cool to let the other side just grab stuff for value to even up the trade
While just enchanting things for value is a fine, fun way to play Estrid, the Masked, things can get out of control quickly if you start playing cards like Overgrowth and Fertile Ground so that Estrid's +2 acts like a massive ramp spell, and then The Chain Veil (perhaps enchanted with a Mask aura thanks to Estrid's 1) give you an easy way to activate your Estrid, the Masked an infinite number of times, potentially making infinite mana by untapping your lands and eventually winning with her Replenish ultimate
It'll be interesting to see exactly how much this card goes for, considering it was purchased for over $5 million
As such, this is among the rarest chase cards ever printed, and its sky-high price point is surely merited