Final Verdict: Sylvan Library gives green decks consistent card selection and an optional advantage
Mazirek, Kraul Death Priest buffs your entire board whenever you or another player at the table sacrifices a creature
It is much easier to kill in cube than it is in a format like modern, in addition to that it is all too easy to ignore the effect of Keranos in the cube as well
However, know that both Dialga EX and Bibarel EX deal a base of 100 DMG, so adding Arceus EX is a sound strategy, though you have better cards to replace Bibarel EX, like the Shaymin cards for instance
Ive opened some boxes recently with my daughter and she pulled two rainbow cards (Blastoise & Piplup, as well as Giratina.) For someone seeing them for the first time they are stunning with incredible texture, however, I dont often hear people talk about them