The first thing that I noticed about Decaying Time Loop is how nicely it works with Life from the Loam , allowing you to dredge a lot and always making sure that you have access to key lands from your graveyard
Whenever a creature with power 2 or less enters the battlefield under your control, you get to draw a cardbut only once per turn, so timing matters
The more creatures you get back from the graveyard, the bigger your advantage will be in terms of deck manipulation as you get to scry a lot of cards
Grading collectibles is an interesting topic that actually deserves its own article
On top of that, you can add a bit of mana to your pool by revealing specific cards off the top of your library during your precombat main phase
1 Archimedes - Electrified Owl 208/204, Amethyst Of all the characters for Arthur to get upstaged by, it had to be Merlin's pet owl, Archimedes