A blue mage is usually more than happy to stall and when stalling you are far more able to blow your mana on things like Impulse
There are a few permanents that offer more doubling up of counters, as well as ones that save counters from removed creatures, but even without these, Counter Blitz is very powerful right out of the box
And if we have decent enough excuses for three of them, it's not like we're gonna leave Phoenix Heart hanging
Cost reduction from cards like Heartstone or even Training Grounds in an Azorius deck can help you activate both abilities in quick succession
Sage Project Whenever Havi or another legendary creature you control dies, return target legendary creature card with lesser mana value from your graveyard to the battlefield tapped
My Little Ponys return to Magic: The Gathering brings Rainbow Dash, Applejack and more to a charity drop Proceeds from Ponies: the Galloping 2 will benefit Extra Life charity in MTGs tenth year of collaboration