Promo Cards and Symbols Cards marked with PROMO instead of a collector number are promotional cardsusually found in tins, special boxes, events, magazines, or other exclusive releases
What this means is that, should the Troll take lethal damage from something (say from combat, or your opponent casting Pyroclasm), the Troll will stay alive as long as you pump two mana into him
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Gumblar Dragon allowed a player to discard 1 or 2 cards when a monster was special summoned to one of the zones this card pointed to, and force an opponent to discard as well
You'll need to find another way to do that, such as Retrieve Prey
Shield: Black Star Promos Type: Colorless Rarity: Promo Retreat cost: Colorless,Colorless