The last board sweeper is somewhat controversial, and while I do not endorse the use of Armageddon I will grant that it is often seen as a staple in a white EDH deck
To augment a creature you have to pay the cost, reveal the card, and then augment a target host, which you can only do as a sorcery
Midnight Clock is a great midgame mana rock that enters the battlefield untapped like the Lapis Orb of Dragonkind, generates blue mana, and refreshes your hand after an average of 3 turn cycles right around the time your hand is starting to get a little empty
Browbeats new art is amazing, because the spell is really like making a deal with the devil
Explorers of the Deep is a green and blue Merfolk list navigated by Hakbal of the Surging Soul
But the low value is justified because you need a larger strategy to make this card truly work