Ive been very critical of Azorius Control decks early into the format, as the lack of other win conditions besides Teferi, Hero of Dominaria is concerning
Its generally better to buy individual booster boxes over cases
"Pay 1 life, Sacrifice this land: Search your library for a [basic land type(s)] card, put it onto the battlefield, then shuffle." A fetch land in MTG is a land that lets you sacrifice it to search your library for a land with the specified land type(s) and put that land onto the battlefield
The Commander Rules Committee has stated that this is because it is very hard to kill more than a single player with poison, especially because your opponents likely are not piling on with their own infect creatures
Cast it with extra mana to make it huge, and you can remove counters to draw cards and create robot tokens and fuel both your board presence and card advantage
Once per turn, you can flash back an instant or sorcery, effectively doubling up on your most critical combo pieces