They each offer almost the same ability with Gemhide being marginally worse in that it lets your opponents slivers (including changelings) also put on their mana fixing, dork hats
While any co-linked "Knightmare" monsters are on the field, for your normal draw in your Draw Phase, draw 1 card for each different card name among those co-linked "Knightmare" monsters, instead of drawing just 1 card
Artifact Rares Black Lotus $5,000/$3,500 Mox Sapphire $2,000/$1,250 Mox Jet $1,500/$1,000 Mox Pearl $1,100/$750 Mox Ruby $1,100/$750 Mox Emerald $1,100/$800 Time Vault $1,000/$700 Mana Vault $400/$250 Forcefield $300/$150 Chaos Orb $250/$125 Illusionary Mask $250/$150 Gauntlet of Might $250/$150 Nevinyrrals Disk $200/$125 Cyclopean Tomb $150/$80 Howling Mine $150/$80 Ankh of Mishra $120/$60 Winter Orb $120/$70 Clockwork Beast $100/$60 Disrupting Scepter $100/$60 Jaymedaye Tome $100/$60 Meekstone $100/$60 ALL OTHER ARTIFACT RARES $80/~$40 Kormus Bell $60/$30 Sunglasses of Urza $60/$30 Theres so much going on here that Im not quite sure where to begin
Bandai does not publish official pull rates