If you play any of these two cards in a casual, fun way, then there is obviously no problem -- but what do you do in the competitive environment
Its strong enough to see play in competitive Magic as an infinite mana sink, but have you ever tried rolling infinite dice
Swordsoul Emergence
8 - Jerky Artworks - Pidgey, Pidgeotto, and Pidgeot ex (Scarlet/Violet: Obsidian Flames) This artist started out strong with Lumineon V CRZ GG39, which was gorgeous because it had dynamic shapes, simple outlines and morphology
Once per turn, you can also Xyz Summon "Kashtira Arise-Heart" by using 1 "Kashtira" monster you control, if an effect of "Kashtira Shangri-Ira" was successfully activated this turn
The above MTG cards are estimated to be the most valuable overall, but there are plenty of others worth at least a couple hundred dollarsenough to be worth covering, one way or another