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once a creature or planeswalker is in play it gets far harder for blue to deal with it, which is where the value of cards like Erode and Bitter Triumph comes from
Given that its detach effect works during the opponent's End Phase, and banishes all cards the opponent controls that were Normal or Special Summoned, or Set that turn, it isn't too difficult to banish enough cards to give Heart-eartH Dragon substantial ATK
Let's check out some mechanics
Iconic Cards: Goblin Guide, Lightning Bolt, and Thalia, Guardian of Thraben Popular Decks: Death and Taxes, Red Deck Wins, Merfolk, Burn 2 Control Control decks are all about controlling the board by stopping your opponents gameplan
At its core, Yu-Gi-Oh