Lightning Helix "Basically the awesomest card ever." Life gain gets no respect, because when you invest mana and cards in life gain it has the nasty habit of not making a difference, especially when you're trying to play a burn-heavy game, which either involves trying to burn out an opponent or all opposing creatures
While it represents one of the most distinctive paths to victory in the game, its a Rube Goldberg machine assembled on the San Andreas Fault, leaving your opponents chances to disrupt you at every stage
Fecund Greenshell's last ability checks the power and toughness of a creature only at the moment it enters
Clocknapper is a very intriguing card
There was which is in a mobile beta
Its more expensive than some other options to manifest creatures, but a repeatable outlet for your extra mana is pretty helpful in those long-running grindy Commander games