This not triggering on any instant / sorcery really hurts since a good chunk of blue's instants are counters.
Am i misreading what you are saying? this does trigger off all the counter spells in blue, but it also triggers off the creatures and enchantments as well.
I don't think this is necessarily a slam dunk, but I don't think the card is bad at all. I can see some mid-sized cubes that want to give the opposition deck a little more love running this.
Tapping something is proactive, where countering is reactive. You want to tap the opponent down during the upkeep/before attackers, which you probably won't be able to do since your instants will be counterspells.
Tapping something is proactive, where countering is reactive. You want to tap the opponent down during the upkeep/before attackers, which you probably won't be able to do since your instants will be counterspells.
[180 classic cube]