Cheapest priced copy (Assassin's Creed): $0.35 at Card Kingdom, near mint, their price list as of .
Labyrinth Adversary 
Creature — Minotaur · 4/3 · Uncommon · Assassin's Creed · #290
Trample (This creature can deal excess combat damage to the player it's attacking.)
Whenever you attack, you may pay {1}{R}. When you do, target creature can't block this turn.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Assassin's Creed | 290 | Uncommon | $0.35 | — |
One ruling from Wizards of the Coast
- 5 July 2024You don’t choose a target for Labyrinth Adversary’s last ability at the time it triggers. Rather, a second “reflexive” ability triggers when you pay {1}{R} this way. You choose a target for that ability as it goes on the stack. Each player may respond to this triggered ability as normal.