#2: The Mycosynth Gardens When it comes to seeing competitive play lands have a natural advantage, because basically every deck needs to run a bunch of them to be able to cast their spells, which greatly lowers the opportunity cost of playing non-basic lands with special abilities
If you end up casting the exiled card, it will go on the stack above the spell with cascade
Harnessed Lightning 2/10 Hard to rate this one as by itself it is really poor, however with other energy cards it quickly starts to look very impressive
Among other things, you gain an infinite storm count, infinite mana, and infinite death triggers
Surprise double strike is one of my favorite effects right now, having single-handedly (ahem) sung the praises of Two-Handed Axe
Subterranean Tremors works best in Gruul decks that ramp through sorceries like Rampant Growth