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Even if you're not interested in a powerful legendary duo, there are some unusual Trainer cards in Primal Clash

Uncommon rarity, making it a valuable collector's item

Magnus' Unearthly Power reduces the cost of your instant and sorcery spells by one generic mana for each creature token you control

A four-point life swing on every creature death puts you so far out of death's reach while Ripper's in play

This is when the price of an asset is based an implausible view of the future

Similarly, a [X] cost becomes "Reduce enchanted creature's toughness by X." You can't pay a cost that would reduce enchanted creature's toughness to less than 0