Long-Forgotten Gohei 
Artifact
$0.31 #15314 0.33 21.9 years
Arcane spells you cast cost 
less to cast.
less to cast.Spirit creatures you control get +1/+1.
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Supreme Phantom90%
$0.33↑#9626↑0.278.1 years↓
"Other Spirits you control get +1/+1."
Gallows Warden90%
$0.11↓#25601↓0.53↑14.9 years↓
"Other Spirit creatures you control get +0/+1."
Battleground Geist90%
$0.05↓#22355↓0.21↓14.9 years↓
"Other Spirit creatures you control get +1/+0."
Patrician Geist87%
$0.17↓#10302↑0.06↓4.9 years↓
"Other Spirits you control get +1/+1."
+1 more matching line
Quintorius, Field Historian82%
$0.18↓#9298↑0.19↓5.4 years↓
"Spirits you control get +1/+0."
Obscura Ascendancy78%
$0.08↓#24513↓0.354.4 years↓
"As long as there are five or more soul counters on this enchantment, Spirits you control get +3/+3."
Kodama of the South Tree78%
$0.75↑#19074↓0.22↓21.9 years
"Whenever you cast a Spirit or Arcane spell, each other creature you control gets +1/+1 and gains trample until end of turn."
Drogskol Captain78%
$0.24↓#8241↑0.06↓14.6 years↓
"Other Spirit creatures you control get +1/+1 and have hexproof."
Iron Lad, Young Avenger76%
$0.33↑#159310.00↓0.2 years↓
"Noncreature spells you cast cost less to cast."
less to cast."
Glorious Anthem76%
$0.38↑#7157↑0.2527.9 years↑
"Creatures you control get +1/+1."
Gaea's Anthem76%
$0.25↓#8921↑0.00↓19.6 years↓
"Creatures you control get +1/+1."
Anthem of Champions76%
$0.25↓#6356↑0.14↓1.8 years↓
"Creatures you control get +1/+1."
Dictate of Heliod76%
$0.37↑#6913↑0.50↑12.3 years↓
"Creatures you control get +2/+2."
Collective Blessing76%
$0.32↑#8078↑0.15↓13.9 years↓
"Creatures you control get +3/+3."
Benalish Marshal76%
$0.48↑#7850↑0.44↑8.4 years↓
"Other creatures you control get +1/+1."
Kongming, "Sleeping Dragon"76%
$0.18↓#176730.4227.3 years↑
"Other creatures you control get +1/+1."
Power Boost72%
$0.20↓#27858↓0.00↓0.2 years↓
"Creatures you control get +1/+0."
Fire Nation's Conquest72%
$0.25↓#20495↓0.00↓0.8 years↓
"Creatures you control get +1/+0."
Death Pit Offering72%
$0.37↑#23656↓0.13↓26.6 years↑
"Creatures you control get +2/+2."
Blessed Orator72%
$0.16↓#25404↓0.2524.9 years↑
"Other creatures you control get +0/+1."