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A creature either needs to do something exciting or be huge (or hopefully both)

During your Main Phase: You can Fusion Summon 1 Fusion Monster from your Extra Deck, using this card you control and other monsters from your hand or field as material

There are a number of popular cards that use X in their mana costs and enter the battlefield with X counters, like Chalice of the Void, Stonecoil Serpent, or Ugin's Conjurant

The simulator can open two packs a day (three with the premium pass), purchasing them with pack points (earned from opening boosters), and doing wonder picks, which give players the chance to pick a copy of a card at random from a pack someone else already opened