If you don't - you still have 2 solid cards individually
Without them we'll have to rely on drawing it ourselves, adding a significant element of luck to the deck
I would love more card draw effects but red isn't overdone with them and so I feel a touch light on win mechanisms and a little overdone with mana generation as it stands
It also has the added bonus of allowing you to untap all your creatures outside of your turn, serving as an excellent defensive tool if you have the mana to spare
What makes it especially strong is that graveyard hate does almost nothing to weaken it because the drake still picks up power from spells in exile, giving it a steady role against decks that try to shut your yard down
Considering that both cards are in print and, discounting the Aftermath debacle, is from Magic's newest set, I'd lean towards selling while prices are high unless you plan on building the deck yourself