If multiple creatures enter the battlefield under your control at the same time, Impact Tremors will trigger that many times
It doesnt take that long to close a game, so it might not make the game about a lot of combat steps, but its a great blocker and an attacking threat thats worth protecting with counterspells, which is a line that youll often have to cross to get blue players interested in this sort of thing
Halimar Depths: tapland which has the upside of setting up our future turns
The odds of this one hitting are long, though, and Porphyry Nodes has gone mostly unplayed for almost a decade
The Hero costs two, is just White, and then when you cast a multicolored spell
By sacrificing the golem, you get one mana of every color