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If that creature isnt a threat, you have the option to just buff Shelob and draw a card
This means you can soak up the damage with non-ex cards while stacking up energy cards on your heavy hitters
Between these threats and more complicated kinds of value engine, discard decks are able to successfully leverage an uneven war of attrition and tempo: drawing enough cheap spells to continuously trade for and neutralise the opponents draws, while also grinding steadily towards a more permanent victory
Since those abilities trigger only once each turn, those additional counters won't cause those abilities to trigger any more that turn
Many sales for large quantities of unopened mystery packs are also popular, giving people the opportunity to experience the thrill of opening the packs to see what they get, without having to also order hundreds of Happy Meals from McDonald's