Rhox

Not trample, and that gap defines how the card plays. Trample lets a creature deal lethal to a blocker and spill the rest onto the player; this 5/5 instead chooses to dump all five damage straight to the defending player and none onto the blocker. The strategic axis is different and arguably nastier from the attacker's seat: a chump-blocker survives, but it accomplishes nothing, because it absorbs zero of the hit. The opponent throws a body in front and still takes the full beating. Block math collapses to a single unappealing option (a double-block big enough to actually kill a 5/5), and the regeneration ability is there precisely to punish that line: hold open, and any single instance of destruction (combat or removal) gets shrugged off. This is green-beats design from an era that leaned on raw stats and resilience rather than the clean evasion keywords already on the books. Rather than hand a fatty trample and call it done, the construction grafts a worse-than-trample, better-against-chumps damage clause onto a regenerator, producing a threat that asks for a real removal spell or a genuine multi-creature commitment rather than a token blocker. The body answers most boards on its own; the optional damage assignment answers the chump; the regeneration answers the trade. Each piece closes one of the outs an opponent would normally use against a six-mana creature.