(Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.) The cost reduction ability of Ephara's Dispersal doesn't affect its mana cost or mana value
This is certainly more Opt than it is Force Spike and should be played in a less disruptive capacity
On the one hand, this deck is quite capable of aggressive starts
Designing buyback cards is very tricky, because any spell you can cast every turn can get very degenerate, even for effects that normally are pretty benign
Each of your combat phases while its on the field gives opponents a chance to tap this troll and prevent it from attacking
Lifelink is still incredibly powerful when a format is dominated by red, and I expect to see Legions Landing show up in many different decks in Standard, maybe even paired with Crested Sunmare