Each (player, phase) cell is independent, so in multiplayer you can yield to a specific opponent's end step
Entomb Tutoring to the graveyard is sometimes better than tutoring to your hand, especially when youre only paying 1 mana for a card like Entomb
Days Undoing does have a drawback, and that does matter, but the main cost of this drawback is stifling ones ability to combo off. If you just use Timetwister fairly, the drawback doesnt even matter much
As, in responding to a question, MTGs Lead Designer, Mark Rosewater, seemed to reveal other supertypes are in the works
It's probably correct to play four copies of Grasp of Darkness in just about any deck that can reliably cast the card on the second turn
When you one a pack, you might see a suspicious-looking card with a small Ditto icon at the bottom, indicating that the Pokmon is a transformed Ditto in reality