While there are other powerful cards like Fairy Tail - Snow or Banishment of the Darklords that offer similar utility and versatility, Keldo's unique effects can still make it a valuable addition, especially in a dedicated build
The Core Mechanics to Look For: Rule-Setting: Many white Auras in MTG act as tax effects, making it expensive for opponents to attack you or cast spells
If an Xyz Monster(s) you control would be destroyed by battle or card effect, you can detach 1 material from this card instead
If this card is sent from the field to the GY: You can destroy all Spell/Trap Cards on the field
Since 'holos' are rarer than other cards, if this is what you're dealing with, it's best to look up online which areas of the card should be holographic, and which shouldn't
And if you just want to play normal match types like Standard or Alchemy and build a deck with the odd booster you earn along the way, you never have to get out your wallet or feel like you should, anyway