Eron the Relentless

Five power with haste that swings the turn it lands, propped against a toughness of two so thin that nearly any blocker or burn spell trades up. The regeneration ability is the whole pitch, and it is priced to hurt: three red mana, a steep tax that competes directly with the red you would rather spend on the offense the creature exists to provide. That tension is the design. Eron wants to attack into open boards and dare you to block, but the moment you commit the regeneration mana you have stalled your own clock, and the shield only saves him from destruction, not from a chump-block that buys a turn or from the toughness math that makes him fragile to incidental damage. The body is all upside on the swing and all liability on the back foot, with an activated ability that asks you to pay through the nose to paper over the second half. The result reads as a legend from a set that prized texture over raw efficiency: a beater whose flavor (relentless, hard to put down) is encoded in mechanics that never quite let the rate feel free.