All of these were printed early on in Magic's lifetime - in Alpha, Beta, or Unlimited - before balance had been fully figured out
It does not provide any inherent offensive power
This listing is for one (1): Mega Evolution ~ Phantasmal Flames
Now, let's say a person (or group of playersagain, it doesn't really matter to our example) purchased all of the copies of Greed listed on TCGplayer

Advanced Search Sets Random Syntax Azula, On the Hunt Azula, Ruthless Firebender Basal Sliver Basal Thrull Black Market Blightsoil Druid Blood Celebrant Blood Pet Blood Vassal Bog Initiate Bog Witch Boiling Rock Rioter Burnt Offering Cabal Ritual Carnival of Souls Carrier Thrall Common Crook Contract Killing Corpsehatch Crypt Ghast Culling the Weak Dark Petition Dark Ritual Deadly Derision Deadly Dispute Deadly Dispute Dire Fleet Hoarder Discreet Retreat Dread Drone Essence Feed Fake Your Own Death Fire Lord Ozai Fire Nation Occupation Gild Gix's Caress Gnarlroot Trapper Gorbag of Minas Morgul Grave Birthing Greedy Freebooter Grim Bounty Heartless Pillage Herald of Hadar Hoard Robber Illuminor Szeras Initiates of the Ebon Hand King Macar, the Gold-Cursed Kingpin, Wilson Fisk Kozilek's Translator Liliana of the Dark Realms Lithoform Blight Liturgy of Blood Lord of the Forsaken Magus of the Coffers Master of Dark Rites Mastermind Plum Memory of Toshiro Morgue Toad Necra Disciple Nirkana Revenant Organ Harvest Overeager Apprentice Pawn of Ulamog Pitiless Plunderer Priest of Gix Priest of Yawgmoth Rain of Filth Rev, Tithe Extractor Revel in Riches Ronin, Shadow Stalker Ruthless Knave Sacrifice Shambling Ghast

The 3-mana enchantment already does work, but squad scales it with the game