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Creature Qty: 1 Price: 0.12 Halsin, Emerald Archdruid : Until end of turn, target token you control becomes a green Bear creature with base power and toughness 4/4 in addition to its other colors and types

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I first heard of Paulo from his Brainburst (now TCGPlayer.com) articles, and even remember the first one I read: this one detailing his near miss at the first Pro Tour Honolulu

destroy both it and this card, and if you do, Special Summon 1 Dragon-Type Xyz or Pendulum Monster from your Extra Deck, but its ATK and DEF become 0, it has its effects negated, also it cannot be used as a Material for a Synchro or Xyz Summon

What it does do is offer perhaps the best kind of removal outside of straight-up exile