Eye of Singularity

A taxation of redundancy disguised as an enchantment. The World supertype is the mechanical engine here: only one World permanent is ever in play, so the card both polices the board against duplicate names and guarantees its own singularity. The first ability is a one-time purge of every doubled-up permanent already present; the second turns every later turn into a singleton format enforced by the rules, where the entry of any nonbasic permanent destroys every earlier copy that shares its name. A second copy of a creature, an artifact, an enchantment, even a freshly entered nonbasic land all trigger the wipe. Basic lands are the deliberate carve-out, the one redundancy the card permits, because without it the enchantment would become a slow-motion land destruction spell that ate the whole table's mana base. The card belongs to a small family of Visions-era symmetric hosers that punish a specific deckbuilding habit rather than a color or a card type: the reward goes to whoever has built the most diverse battlefield, and the penalty lands hardest on strategies leaning on four-of consistency or token swarms of identically named bodies. The "can't be regenerated" rider on both clauses is what keeps the effect clean: this is not a tempo speed bump but a permanent rewrite of how many of each name the game will tolerate.