iono japanese pokemon card Clay Burst Super Rare #091 PSA 9 Preserved in a tamper Iono #96 Prices | Pokemon

They are the top competition for their respective slots

But this only works for cards found in main sets and to a lesser extent special sets since they're usually kept in production for a while (and if what TPCi said in the past is true, will continue to be printed as long as there's demand for 'em and they're not rotated out), this rule doesn't work for promos since they're usually only given away during a certain window of time and given a limited print run that's long enough to fit the predicted demand

Enthusiastic Study CMC: 2R Type: Instant Rarity: Common First ability: Target creature gets +3/+1 and gains Trample until end of turn

Some items can quickly become hard to find