Each pack contains 15 cards and 1 foil double-sided token, with 1 foil alternate frame rare/mythic (Expedition, showcase, borderless, or extended art), 1 foil rare or mythic, 1 non-foil borderless or showcase rare or mythic, 1 non-foil extended art rare or mythic, 1 foil showcase common/uncommon, 2 non-foil showcase commons/uncommons, 2 foil uncommons, 5 foil commons, and 1 foil full art basic land.
This basically gives you the ability to draw your deck, and to deal damage equal to your remaining deck size distributed to your opponents
there's a dedicated channel there for this event.
If you're unsure what your goals should be, try asking yourself if you plan to be the aggressor or not
If the copied creature is copying something else, then Mockingbird enters as whatever that creature copied, with the noted exceptions
Cards that are well-keptwithout bends, tears, or stainsare far more desirable than those in poor shape