Even the most well-shuffled deck will eventually mill two lands or two creatures when those are the most numerous cards in the deck, so the length of this covenant is limited
In practice, it didn't work out that way as Kobolds didn't get haste, so they could never swing on their first turn, leaving them with a very wide open point where they could get killed before the horde can attack
While Surging Sparks may be the set partly responsible for the renewed frenzy for Pokemon TCG trading cards thats continued on throughout 2025, as you can see from this list compared to where it was shortly after launch, prices have dramatically cooled

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