In the late game, you'll either try to pull ahead in cards using a combination of Vraska, map tokens from Sentinel, the adventure side of Dreadknight, and Aclazotz's discard triggers , or look for an opportunity to combo by playing Vraska with a level 3 Innkeeper's Talent on board and ultimate her to instantly win the game
Normal prints of Night Stretcher go for almost $3, so whether you have one of those or a Reverse Holo version, its worth separating from the true bulk
Upgrading to a full account gets you 2 more of every Standard-legal common, 1 more of every Standard-legal uncommon, the ability to get cards, and the ability to enter tournaments
In either version you also have the option to just whack your opponent with a very beefy Kappa Cannoneer - that's never a bad plan
Lapis Orb of Dragonkind enters the battlefield untapped, adds colored mana that has no restrictions on its use, and actively rewards you with a solid scry effect for casting Dragons or Changelings with it