A three mana enter-the-battlefield tutor is an incredibly powerful effect, especially if you have a way to trigger it multiple times
Blacks earliest mana ramp cards were mana accelerators, cards that gave you a one-time mana boost either unconditionally or in exchange for doing something like sacrificing a creature
My first question for players stuck at square one like this is can you simply become less reliant on your commander? Ultimately, its very hard to keep your commander on the board if everybody else wants them gone, and if your deck doesnt function without that creature, your opponents will be tempted to shut them down as soon as you pick up steam
For spells with X in their mana costs, use the value chosen for X to determine if the spells converted mana cost is 3 or less
For example, while it's in your graveyard, Ondu Knotmaster is a white and black creature card whose mana value is 4
Lightning Greaves Lightning Greaves is one of the most powerful cards in the equipment department because of its equip cost