You cannot choose to have it enter the battlefield as a creature
What are the weaknesses and retreat cost of this Ferroseed card
Sol Ring, Arcane Signet, Astral Cornucopia, Everflowing Chalice, and Pentad Prism: scalable ramp that benefits from Atraxas proliferation
Delirium was also a core mechanic of the next set in this block, Eldritch Moon , which featured Emrakul's emergence into the plane and subsequent warping of the plane into a Lovecraftian horror: Since its original printing, Delirium has shown up as a mechanic in only a few other Magic sets, Modern Horizons 2 and 3 , and Duskmourn: House of Horror
This is good for players who enjoy playing Sealed formats and opening booster boxes, and players who are transiting from Standard to Pioneer, as they will easily build Pioneer decks from cards they already have