While this is definitely a lot less than the market price, thats still a 365% price spike
6 Koichi Kimura Fill Your Trash Easily Most four-cost tamers are usually memory setters, meaning they will set your memory marker to three at the start of your turn, but Koichi Kimura is closer to most three-cost tamers in effect
But exiling is better, especially those pesky indestructible creatures

Deck List Prank-KidsDeck List Pure Prank-Kids Deck and Deck Instructions "Pure Prank-Kids" Deck 2019 Deck Introduction/Deck Commentary Related deck "Prank-Kids" Other Deck List 2023-01-21 Prank-Kids Morganite 2020-11-26 Plan Repro Escatos 2020-09-27 Dogmatika, Prank-Kids with Sandra 2020-09-13 Prank-Kids 2020-08-28 Nemeses plan ver.2 (with explanation) 2020-08-13 Prank-Kids Nemeses 2020-07-16 Now Prank-Kids pure construction 2020-02-16 Sandra Nemeses Prank-Kids 2020-01-18 Nemeses Plan 2018-12-25 Heisei last maha speed beat 2018-11-03 All attributes Prank-Kids 2018-10-13 Pure Prank-Kids (Suppression & 1 second kill) 2018-10-09 Second attack one kill type Prank-Kids 2018-09-21 Ferret shaft [Prank-Kids] 10/13 version 2018-08-29 [Arrange and Destroy ] TRUE Sumeragi Prank-Kids See all Deck Lists for "Prank-Kids" 2023-01-21 Prank-Kids Morganite 2020-11-26 Plan Repro Escatos 2020-09-27 Dogmatika, Prank-Kids with Sandra 2020-09-13 Prank-Kids 2020-08-28 Nemeses plan ver.2 (with explanation) 2020-08-13 Prank-Kids Nemeses 2020-07-16 Now Prank-Kids pure construction 2020-02-16 Sandra Nemeses Prank-Kids 2020-01-18 Nemeses Plan 2018-12-25 Heisei last maha speed beat 2018-11-03 All attributes Prank-Kids 2018-10-13 Pure Prank-Kids (Suppression & 1 second kill) 2018-10-09 Second attack one kill type Prank-Kids 2018-09-21 Ferret shaft [Prank-Kids] 10/13 version 2018-08-29 [Arrange and Destroy ] TRUE Sumeragi Prank-Kids See all Deck Lists for "Prank-Kids" Update Information - NEW - 07/17 00:39 Review Paleozoic CambrorasterCategory exclusive link 2 monsters

Getting to cast creatures from your library gives you so much card advantage, and the fail-safe is a respectable 2/3 body for 3 mana
This is probably the reason you see a lot of these on vintage sports