Knowledge pool, Void mirror and taxes

Asked by Madcookie 1 year ago

Does tax effects like Grand Arbiter Augustin IV fizzle the Knowledge Pool + Void Mirror lock by allowing the opponents to pay 1 extra mana (assuming they pick colored) to cast a spell from the pool?

I'm fairly sure it's a nonbo but want to be extra sure.

Delphen7 says... Accepted answer #1

Because Arbiter is an increase, Void Mirror will not counter it.

Relevant ruling on Prismatic Ending: "If there are any alternative or additional costs to cast a spell with a converge ability, the colors of mana spent to pay those costs will count. (2021-06-18)

The notable text here is "If there are any alternative or additional costs to cast a spell...the colors of mana spent to pay those costs will count".

It's worth nothing that an effect like Mana Tithe is not an additional cost, as the mana paid here goes towards the counterspell tax and not the cast spell, and so paying colored mana does not matter.

August 16, 2022 7:39 p.m.