Whenever I don't have a better name for these, this is my default
Mutavault is considered a powerful card because it can either provide one colorless mana or, for the cost of one mana, become a 2/2 creature with all types until the end of the turn
I think that Bontu has seen some play in the sideboard of some sacrifice decks or as a way to refuel, but the others dont do anything the turn they come down which is a no-no for something that costs 5 mana
I have an Avacyn, Angel of Hope that smelled like weed for the longest time because the guy I traded it from had it next to his marijuana.The card itself was fine and luckily the smell went away with time
If you're building a deck on a budget, I'd aim to grab two of the cheapest tutors available to you
With all this taken into account I much prefer to play Memory Lapse in the proactive decks than can apply pressure and get on the front foot