Spent three hours in the top 50 with a speed rainbow (upgraded) and scored the following:
1 shard of gratitude
10 relic
6 shards of readiness
1 discord
1 titan
1 druidic staff
2 arctic squid
3 trident
2 miracle
2 eternity
8 vampire stilleto
and... 2,757 electrum after selling off the non-rare cards (included 10 relics).
Here's an updated list of rare card farms and some other info I came up with.
RARE FARMS
perflubon: 30 cards, sor, miracle (awesome farm - thank you! whoever you are)
10 men: 30 cards, sor, eternity
chaoticendeavors: 30 cards, sor, relic
liberalboy47: 30 cards, vampire dagger, arctic octupus, lobotomizer
getawu: 30 cards, arctic octopus, titan
girlsgeneration: 30 cards, titan, poseidon
Sir Valimont: 30 cards, sor, sog, sod, arsenic, vampire dagger, fahrenheit, morning glory, arctic octopus, eternity, poseidon, discord, jade staff
theonlyrealbeef: 30 cards, vampire dagger
deepdown: 30 cards, relic
REGULAR DECKS WITH RARES
Sol743: 60 cards, sod, sor, relic, poseidon, pulverizer
pertvald: 60 cards, has sor, sog, pharaoh, miracle, pulverizer
AntiLord: 57 cards, sog, pulverizer, miracle
oxoxen: 31 cards, sog, vampire dagger
zse: 30 cards, sog, eternity, pulverizer
cisco: 60 cards, sog, sod, pharaoh, pulverizer
majofa: 35 cards, sog, pulverizer
willowhawk: 45 cards, sog, electrocutor
emiel2: 31 cards, vampire dagger
aricortez2: 60 cards, sod, sog
nottobe: 30 cards, eternity, relic
Cheongmaster: 60 cards, sog, miracle, eternity
infernet89: 31 cards, discord, relic
Pain: 30 cards, vampire dagger
Pervepic: 60 cards, sog, eternity
Daytripper: 35 cards, sog, pulverizer
crimsonflippa: 30 cards, titan
quantumt: 35 cards, sog, pulverizer, miracle
sing0629: 31 cards, vampire dagger
Donot: 31 cards, sog,
She: 60 cards, sog, sod, lobotomizer
hawk203: 54 cards, sog, eternity
Tea is good: 40 cards, sog, pulverizer
BatCountry: 30 cards, sog, relic
omegareaper: 30 cards, arsenic
tata07: 31 cards, sog, arsenic
Tampon: 33 cards, eternity
DECKS WITH NO RARES
essence: 30 cards
Bluesky21: 30 cards
senzaclue: 30 cards
Bootsza: 30 cards
Geralt76: 60 cards
lokiburn: 30 cards
wolfunit: 30 cards
senzaclue: 30 cards
hrmmm: 31 cards