I saw some lists that ran the full four, but I am skeptical of running that many since they get weaker in multiples
When cards you own on MTG Arena are banned, you get wildcards back of an equal rarity, which you can then spend on new cards
The very best of these is definitely Chromatic Lantern, providing both ramp and unparralled mana-fixing for just 3 mana
There are also many Japan-exclusive Pokmon cards , which are inevitably more valuable than the average English card due to their inherent rarity
On the other hand, if your opponent is very aggressive, and you can count on your opponent always playing the most powerful spell at the first opportunity, this might be an opponent you can use permission spells to good effect against
Book of Life [1st Edition] PGD-033 YuGiOh Pharaonic Guardian Keep track of your collection value over time