Begin a new adventure with Pokmon ex
You should just be aware that it exists if youre using Arena to practice for a tabletop event
Cards that let you choose a type , like Reflecting Pool, do let you produce colorless mana as long as you meet the indicated requirements (in this case, having a land that can produce colorless mana, like Adarkar Wastes)
Remove a +1/+1 counter from Kurbis: Prevent all damage that would be dealt this turn to another target creature with a +1/+1 counter on it
Granted not all of them are guaranteed to increase your win rate (though most of them likely would), but they are guaranteed to make your entry fee in the event effectively much cheaper
Blastoise Presentation (1998) Created by Wizards of the Coast as a prototype card to secure Nintendo's approval for the English-language Pokmon TCG, only a handful of these cards exist