The Ur-Dragon There is a real argument for Scion of the Ur-Dragon being the best Dragon card in Commander, but that arguments a bit tougher to make in regards to it being the best Dragon Commander in the game
The 8 number by the card ID shows its from set 8, but as with all pre-release cards, it wont be legal to play until set 8 fully releases
After those four packs, everyone will have drafted 48 cards
According to ptcgpocket.gg, there is only a 12.66% chance of Cresselia ex dropping when opening promo packs, while Electivire has a 15.82% chance, and Turtwig, Misdreavus, and Skarmory have a 23.84% chance of appearing
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As such, if Wizards' baseline power level for mana rocks was the Signets and they accidentally miss by printing a cycle that's a little bit too good, we're right back into the fast-mana danger zone