Cheapest priced copy (Magic 2010): $0.35 at Card Kingdom, near mint, their price list as of .
Wall of Frost 
Creature — Wall · 0/7 · Uncommon · Magic 2014 · #78
Defender
Whenever this creature blocks a creature, that creature doesn't untap during its controller's next untap step.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
8 printings · $0.35 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic 2010 | 80 | Uncommon | $0.35 | $1.49 |
| Magic 2011 | 79 | Uncommon | $0.35 | $0.79 |
| Magic 2014 | 78 | Uncommon | $0.35 | $0.79 |
| Magic 2015 | 83 | Uncommon | $0.35 | $0.49 |
| Modern Masters 2017 | 56 | Uncommon | $0.35 | $0.49 |
| Planechase 2012 | 28 | Uncommon | $0.49 | — |
| Planechase Anthology | 28 | Uncommon | $0.39 | — |
| The List | MM3-56 | Uncommon | $0.35 | — |
2 rulings from Wizards of the Coast
- 18 July 2014If the creature isn’t tapped during its controller’s next untap step (perhaps because it was untapped by a spell), Wall of Frost’s ability has no effect at that time. It won’t try to keep the creature tapped on subsequent turns.
- 18 July 2014Wall of Frost’s ability tracks the creature, not the creature’s controller. That is, if the creature changes controllers before its first controller’s next untap step, then it won’t untap during its new controller’s next untap step.