Sphere of Safety
Enchantment{4}{W}
Creatures can't attack you or planeswalkers you control unless their controller pays {X} for each of those creatures, where X is the number of enchantments you control.
Colour identity White
In short
Sphere of Safety has 9 listed printings; the most valuable is the Secret Lair · Confetti Foil printing from SLD at US$29.99 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.
Every Sphere of Safety printing
Secret Lair · Confetti Foil
Sphere of Safety
SLD · 2331
TCGplayer market
US$29.99
Secret Lair
Sphere of Safety
SLD · 280
TCGplayer market
US$16.01
Secret Lair · Rainbow Foil
Sphere of Safety
SLD · 2316
TCGplayer market
US$15.06
Secret Lair
Sphere of Safety
SLD · 2316
TCGplayer market
US$14.04
Secret Lair
Sphere of Safety
SLD · 588
TCGplayer market
US$9.00
Retro Frame
Sphere of Safety
RVR · 447
TCGplayer market
US$5.08
Sphere of Safety
DSC · 104
TCGplayer market
US$4.23
Sphere of Safety
RTR · 24
TCGplayer market
US$3.51
Sphere of Safety
C16 · 77
TCGplayer market
US$3.48