Dishonourable mention: [card]True-Name Nemesis[/card] I have accepted True-Names existence in Legacy, but I hate the fact that this card will exist in cubes
Lifegain aside, its hard to go wrong with a commander that draws you at least one extra card a turn when you make a land drop, and often more once you throw in ramp spells
Atmosphere, theming, and synergy are off the charts
Obviously, this necessitates playing this card with as few cards in hand as possible, while hoping your opponent is holding at least five cards in theirs
Simic Ascendancy Unlike Helix Pinnacle, Simic Ascendancy doesnt need an insane amount of mana to pull off and you can even build a solid EDH deck around it
Option 1: Open the Armory ($0.69) When you just need to get your hands on those Swiftfoot Boots, Open the Armory is a fantastic and efficient choice