Do you think white’s taxing counterspells should be weaker than blue’s, on par with blue’s, be better than blue’s or totally replace blue’s?
I'm of the opinion that White counterspells shouldn't be much more powerful than
Quench. As much as I love countermagic, I think too many counterspells lead to unfun gameplay where one or more players are unable to resolve anything. Unironically I think that's the reason why so many people hate control decks– while the gameplan of controlling the game and resource economy isn't inherently un-fun, people
hate not being able to resolve their spells. This is especially true when the control player can drop a game-winning bomb like
Teferi, Hero of Dominaria and still hold up a
mana leak to shut down interaction.
Therefore, I think giving White counterspells is a risky business. On one hand, I think giving decks like Selesnya Tokens and Boros Aggro the ability to disrupt the opponent's plan is a net positive. On the other hand, giving decks like Azorius Control another entire color of counterspells sounds like it could be miserable. This isn't even to mention the fact that decks like Abzan and Mardu would now have access to counterspells, which could make them reactive powerhouses potentially even better than some Blue decks.
For that reason, I think White counterspells need to be relatively weak, if they exist at all. They need to be good enough to be reasonable options, but not so good that they bolster or invalidate Blue's counterspells. I think
Mana Tithe is an appropriately powered White counterspell– but I don't know what else they should look like.