Basalt Golem

A combat-deterrent design dressed up as a beater, and the two halves of the text turn out to feed each other rather than sit side by side. The first clause keeps artifact creatures from blocking it; the second turns any non-artifact blocker into a 0/2 Wall artifact token at end of combat. Read together, those lines build a one-way ratchet: every creature the defender commits to blocking is converted into precisely the kind of body that can never block the Golem again. The trade is worse for the defender than it looks, since they swap a real creature for a defender-only token, and that token is then locked out of the matchup by the unblockable-by-artifacts clause. Over successive attacks the Golem either connects unopposed or whittles the opposing ground into a row of inert Walls it walks straight past. Both halves use the stack (the initial "becomes blocked" trigger and the delayed end-of-combat sacrifice), so an opponent retains response windows, and the conversion is a slow-motion edict paid one block at a time rather than all at once. As a five-mana 2/4, the rate was never the point. What this card preserves is a vintage school of combat-math creatures that taxed the act of blocking rather than the board state, and the rider that manufactures its own permanently-locked-out blockers, unusual for its time, is where the idea actually lives.