It is a massive crustacean Kaiju that was created out of the chemical weapon known as the Oyxgen Destroyer, which was used to kill the original Godzilla in 1954
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
-Compatible Sizes: Available in two standard sizes (66x91mm and 62x89mm), ideal for popular card games like MTG, Pokemon, One Piece and YU-GI-OH
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)
(Scryfall note) The cost reduction applies only to generic mana in the total cost of blue spells you cast