gold plated pokemon card Charizard 1st Edition - Rare Collector Glossy Card Gold-Plated Pokemon Cards from Burger

(Scryfall note) The cost reduction applies only to generic mana in the total cost of blue spells you cast

Well, the catch is that The Millennium Calendar takes about 1,000 years to get there, and there arent too many ways to cheese the win since it only picks up counters during your untap step (during which no one can cast spells or activate abilities)

6 Teachings Of The Archaics Teachings of the Archaics is a valuable tool to keep in your back pocketyour back pocket being your sideboard in this case

If a card whose Dash cost was paid is no longer on the battlefield when the turn ends, it wont return back to your hand, itll stay wherever it now is

Used in all formats, going even as far as Legacy

Or you might just have Snapcaster Mage for the cast it (again) later option