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Most of the time you can make a pretty educated guess about what is coming at you if they don't play much

The Cryptids take full advantage of this trope

If those Zombies stick around, I'm going to populate hard and often and really fill the board with nonsense

Its completely understandable to say to deck with it, and find something already built online, a practice called netdecking. Lots of Magic websites that catalog or archive decks show you the decklist and also provide a copiable list so that you can import the deck to MTG Arena or MTGO

In many decks, they end up being the anchor of the strategy, whether thats reanimating creatures, looping spells, or enabling anything from cost reduction to card draw

It was the cheapest way to get collector boosters at launch, so I may have bought a few