Its not even foil, which lowered its collectibility and price in my eyes
Seven mana is a hefty investment, but if it lives to your end step, you get two powerful triggers a Raise Dead for an Eldrazi creature card in your graveyard, and two Eldrazi Scion token creatures you can use to help cast your Eldrazi spell later
Bladecoil Serpent Versatile, and extremely powerful (duh!) picking Bladecoil Serpent first is bound to impact the rest of your draft as you decide which of three colour pairs to go for - but it would be pretty good even if you were only getting one of its effects
Juggletron gets +3/+0 for each item in its art that's not touching Juggletron, another item, or the card frame
These are the cards that often just end the games immediately but are at their best when they're conditional or can be dealt with easily
Cards like Murder, Journey to Nowhere, and Fatal Push can remove most deathtouch creatures with no problem