The best way I know for figuring out what the 20% actually are is by fully understanding the interactions between all of the cards not just the ones that look good at first glance
From that comparatively dismal start, the prices of Hidetsugu, Devouring Chaos (Neon Red) would fluctuate heavily, although it was never more expensive than $4000.25 , according to MTGStocks
Finally, if you have some way of untapping a bunch of Creatures, they can be used multiple times, which has its own value
Featuring a unique Prerelease stamp, this card was never widely available, instantly making it a collector obsession
Whenever equipped creature deals combat damage to a player, put a +1/+1 counter on a creature you control, then proliferate
Three simple words that change the game long term creatures cant block