Cheapest priced copy (Wilds of Eldraine): $0.35 at Card Kingdom, near mint, their price list as of .
Icewrought Sentry 
Creature — Elemental Soldier · 2/3 · Uncommon · Wilds of Eldraine · #55
Vigilance
Whenever this creature attacks, you may pay {1}{U}. When you do, tap target creature an opponent controls.
Whenever you tap an untapped creature an opponent controls, this creature gets +2/+1 until end of turn.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Wilds of Eldraine | 55 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 1 September 2023Icewrought Sentry's last ability will trigger only when an effect instructs you to tap an opponent's creature. It won't trigger if a spell or ability you control instructs an opponent to tap a creature they control. For example, if you control Tangle Wire and an opponent taps an untapped creature they control as part of the resolution of Tangle Wire's triggered ability, Icewrought Sentry's ability won't trigger.