The design nods at the LEGEND cards of the HeartGold & SoulSilver era, where you needed both halves to play Lugia LEGEND
With a sizable power and toughness of 6/6, repeating discard, and possible life loss triggers every time he attacks, Kroxa will end almost any game in short order
With 20 mythics, a rare to mythic ratio of 7:1 (to maintain the 1 in 8 chance of cracking a mythic), and 2 copies of every rare per sheet, that means there are 70 different rares total, a 1 in 80 chance per pack of opening any rare, and a 1 in 160 chance of opening any mythic
New Leaders in OP-16 The official page highlights six new Leaders
It can Rampant Growth for another mana with Fertile Footsteps and then later arrives to the party with a 7-drop X/X equal to your land count, which count be quite a lot
Oketras Monument Oketra's Monument is the strongest of the monument cycle from Amonkhet