Whats your favorite/best card with at least 3 mana pips? (Building Omnath Bombs)

Im building an omnath locus of all deck around the idea of just cheating out bombs. Looking for any card recommendations that come down and make an impact, pay off having lots of mana, or anything that supports the general Omnath strategy. I know there will be lots of amazing creatures, but would love to find some cards of other types too. That way i have a better chance of hitting the omnath trigger every turn.