These play hand-in-hand, but ramp refers to an increased amount of mana available to you, whereas cost reduction just lets you allocate your resources a different way
(This is the same basic principle why Giant Growth rocks by the way.) Each of these four creatures says if you jump through the right hoop, you can make your creature grow
Obviously, there are many top-notch removal spells available to choose from and depending on the colors of your Commander, some cards are off the table for you
While there are plenty of substitutes that deal with artifacts and enchantments like Ancient Grudge, Wear // Tear, Nature's Claim, Vandalblast, and Kataki, War's Wage, none of these cards really do what Stony Silence does
A box of LTR set boosters is great if you are not looking to draft
Several cards that are highly synergistic with Magda also made it through rotation