Cards like Thundermaw Hellkite are fantastic threats too, and great finishers, but they rarely do the whole job, they rely on other cards having done a lot of prior work
I'd cut the Saw It Comings and play six total counters (four Negate and two Disdainful Strokes), while filling the rest of the slots with removal for the creature matchups
These lands give you access to two mana colours, and enter the field untapped as long as you have two or more opponents
Belcher Belcher is often seen alongside Balustrade Spy, and Undercity Informant, to give the Belcher/Oops plan additional robustness
The only downside is that you need to keep a creature alive in addition to the Enchantment in order to maintain that banishment, but Sheltered by Ghosts more than makes up for this by giving the creature in question Ward 2, for a total package that does more than other cards for less mana