There are plenty of options for Mana rocks, and in the 3 Mana Value (formerly known as Converted Mana Cost) category you have fan-favourites Commanders Sphere, Chromatic Lantern, and Wayfarers Bauble (3 to cast and activate)
You can find full details in our guide to MTG deck archetypes - but here's a short summary of the six types and how they play: Aggro - Win fast with aggressive damage, mostly using creatures
New Phyrexia - Complete Set (Factory Sealed) $452.99 US Shipping Only Due to export restrictions, this item may only be shipped to addresses in the United States, APO/FPO addresses, and Puerto Rico
Infamous for its five-card Epilogue packs, the mini-set is something that Wizards of the Coast has never attempted before
Add token producers like Ophiomancer or Bloodghast for cheap fodder and keep the pressure going
Binding the Old Gods While it might not be as flashy and instantly impactful as some of the other options here, Binding the Old Gods is an exceptional value pick