yugioh sword cards Yu-Gi-Oh! 300/100 Sword Master - Yugipedia

It essentially lets you turn 3 mana into 4 ( plus tapping this land), but you have to target something thats able to attack, and actually get to attack

Its an efficient mixture of graveyard hate and value card all around

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Current listings place the card at $1,646, and thats for one in near-mint condition