The sets announced so far include Mulan - Imperial Soldier and Hades - King Of Olympus plus you'll also be able to get the Illumineer's Trove which comes with more booster packs, deck boxes and additional "getting started" goodness
Depending on the situation, a monster on your opponent's field can also be offered as Tribute, making this a monster to be reckoned with
Crown Cards : The rarest cards, with only a 0.013% pull rate, making them prized treasures for collectors
Do I need one copy or multiple copies in play
If, however, one creature has first strike, that creature is given a first chance shot at knocking the other creature out with impunity: if the creature with first strike can kill the defending creature, the defending creature dies immediately, even if the defending creature would otherwise kill the attacking creature
You generally want to draw a card this frequently for one of two reasons: either the card is necessary for the fundamental functioning of the archetype, or the card is good to draw at every single point in the game