Lasting Fayth
Sacrifice it for a card and keep on, or just use it for creature things like attacking, blocking, and grabbing a piece of equipment
Its a hugely influential work, and one that, like Lord of the Rings and Final Fantasy, has more than enough iconic elements to power a full expansion
Potential Infinites There are a few infinite loops in here to generate all the landfall we could ever need - the Temur Charger can be turned face up at the cost of revealing a green card from hand, so anything that costs 1 to sacrifice it can be looped by paying the 1 and sacrificing it, returning it as a land, tap for 1 green, morph for 0 mana, then paying the 1 and sacrificing it, ad infinitum
The Soulripper can sacrifice other creatures and artifacts to gain +1/+1 counters and menace until the end of the turn