Whatnot Whatnot is a little bit different than most platforms, and Ive never engaged with it myself, so Im a little wary to give it a full recommendation
The Dragon Shield MTG sleeve is the best option that balances durability, card protection, and ease of shuffling
With Electro, you keep red mana, and even have a way to punish your opponents if they kill him
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However, there have been installments where the aim of the antagonist is to take the power of the crystals for themselves, meaning they have caused conflicts for players when attempting to thwart those foes
Its simply asking for a guide to navigate those situations. You should also try to be respectful