Mindslicer and Sire of Insanity hold no fear for you
At a minimum, every card you care about should go into a soft plastic sleeve, often called a "penny sleeve." For your more valuable pulls, like a Special Illustration Rare, consider double-sleeving for an extra layer of protection
The equivalent is paying $5 for a Pokmon pack, and The Pokmon Company asking if you would sell that Mega Charizard X SIR back to them, so they can put it back into the pool of potential wins
It keeps every bit of green mana you generate across turns, and instead of fading away, that extra mana makes it grow larger and larger
Some people love to sell Japanese pokemon cards, which are more profitable and less prone to price swings than their English counterparts