Normally that would mean you can only use that mana for Instants and activated abilities, but Mai and Zuko add two more card types to the list
The Ramp Suite The Ur-Dragon provides passive ramp from the command zone thanks to its eminence ability, but Tiamat doesnt have that luxury
The toolbox contains enough gameplay accessories for two players to battle, including stackable damage counters, three-dimensional Poison and Burn markers and metal orbs that take the place of Pokmon coins
Age If you have cards from the late 1990s and early 2000s, these can benefit from original collector demand, finite supply, and culture significance
Anything that triggers "at the beginning of your upkeep" or similar will trigger during the upkeep step, and you'll eventually draw a card for your draw step
Population is the part most write-ups leave out