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
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)
My final Sealed pool was, in my opinion, the worst I opened
-Compatible Sizes: Available in two standard sizes (66x91mm and 62x89mm), ideal for popular card games like MTG, Pokemon, One Piece and YU-GI-OH
Used in all formats, going even as far as Legacy
That does not mean it isnt still a good deck, however, and numerous players have put up strong numbers with the list