What playtest or silver-bordered cards were eventually tweaked and printed in black border?

Question

The playtest card Boneyard Aberration is being printed digitally in Jumpstart Horizons. It's a digital-only black bordered equivalent to the playtest card Bone Rattler with some minor rebalancing.

Similarly, the silver-bordered Giant Fan was later reprinted in black border as Power Conduit with some minor rules tweaking and rebalancing.

What other playtest cards from the Mystery Booster set or silver-bordered cards from the Unsets were later printed (possibly with balance or rules tweaks) in a black bordered set?

Answer 1

The Cheese Stands Alone → Barren Glory

Hungry Hungry Heifer ≈ Chisei, Heart of Oceans

Rocket-Powered Turbo Slug ≈ Pact cycle

The Ultimate Nightmare of Wizards of the Coast® Customer Service ≈ Comet Storm

Krark's Other Thumb ≈ Barbarian Class, Pixie Guide

Assquatch ≈ Coercive Recruiter

Super-Duper Death Ray → Flame Spill

Enchantmentize → One with the Stars

Answer 2

There are probably quite a few more that I can't think of right now, so I've marked this as a Community Wiki answer.

• _____ → Spy Kit
• Angelic Rocket → Meteor Golem