Because a merged permanent is the same object that it was before, it hasn’t just come under a player’s control, any continuous effects that affected it continue to do so, and so on.
July 25, 2025 · Edge of Eternities
If it’s neither day nor night, this check doesn’t happen and it remains neither.
April 4, 2025 · Tarkir: Dragonstorm
Once the last player has either accepted or shortened the shortcut proposal, the shortcut is taken. The game advances to the last proposed ending point, with all game choices contained in the shortcut proposal having been taken. If the shortcut was shortened from the original proposal, the player who now has priority must make a different game choice than what was originally proposed for that player.