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Most decks run about 1015 Energy cards, depending on how fast you want to go and how much Energy your attackers need

Polygon has revealed that, along with the regular Play and Collector boosters, Foundations will also be sold in Beginner boxes and Starter collections

Ripjaw Raptor Ripjaw Raptor is a good card to have against aggressive and midrange decks

shuffle into the Deck, "Vaalmonica" cards from your face-up Extra Deck, GY, and/or banishment, except "Vaalmonica Ereditare", up to the number of Resonance Counters on your field, then you can draw 1 card for every 3 cards shuffled

Obviously, it doesn't revive Xyz or Link monsters, so the usefulness is somewhat limited