Flavorfully, it's an amalgamation of five other artifacts that split back up into its individual components when it's dealt with
No, the only step that happens before your upkeep is the untap step, and you do not get priority during the untap step
Continuous effects that affect the size of your hand do not affect an object, they modify the game rules
Morningtide focused on five different creature types that were classes: Rogue, Shaman, Soldier, Warrior, and Wizard
Even today, after four years worth of dust settling, he remains banned in five different constructed formats
Any abilities that trigger when a creature with a certain power enters the battlefield, such as that of Mentor of the Meek, will see the token enter as a 0/0 creature before it gets +1/+1 counters