I would like to see more of it but typically on cheaper, calmer, less proactive cards
There are plenty of resources on this topic around, but none which both span the whole history of the TCG and employ a consistent methodology

The calculator evaluates synergy across 14 strategic axes: Sacrifice sacrifice outlets + death trigger payoffs +1/+1 Counters counter sources + counter synergies (proliferate, doubling) Tokens token generators + creature count payoffs (convoke, Craterhoof effects) Landfall extra land plays/fetches + landfall triggers ETB/Blink flicker effects + enter-the-battlefield triggers Graveyard mill/discard/self-mill + graveyard recursion Creature Cheat reanimation/cheat effects + expensive creatures to cheat out Spellslinger instants/sorceries + cast-trigger payoffs Artifacts artifact density + artifact synergies (affinity, metalcraft) Enchantress enchantment density + enchantment triggers (constellation) Voltron equipment/aura count + equipped/enchanted creature payoffs Stax tax/denial pieces + asymmetric cost reduction Lifegain life gain sources + life gain triggers Wheels wheel effects + discard/draw triggers For each axis, the calculator counts enablers (the cards that set up the strategy) and payoffs (the cards that benefit from the strategy)

The winners could have easily boxed them up, forgotten about them, and never sold them or traded them with others, making them even rarer on the public market than if 20 copies were distributed separately
[17] A grey symbol with a star is considered colorless and can use any color Energy card