Cheapest priced copy (Modern Horizons 3 Commander): $0.69 at Card Kingdom, near mint, their price list as of .
Twins of Discord 
Creature — Eldrazi · 8/6 · Rare · Modern Horizons 3 Commander · #37
Whenever you attack, choose odd or even. Creatures with mana value of that quality can't block this turn. (Zero is even.)
Each other colorless creature you control has bloodthirst 2. (If an opponent was dealt damage this turn, that creature enters with two additional +1/+1 counters on it.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.69 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons 3 Commander | 37 | Rare | $0.69 | $1.99 |
4 rulings from Wizards of the Coast
- 7 June 2024Multiple instances of bloodthirst are cumulative. For example, if you control Twins of Discord and a colorless creature with bloodthirst 1 enters the battlefield under your control, that creature will enter the battlefield with three +1/+1 counters on it if an opponent has been dealt damage that turn.
- 7 June 2024If a creature on the battlefield has {X} in its mana cost, X is 0 when determining its mana value.
- 7 June 2024The mana value of a token that isn't a copy of another object is 0.
- 7 June 2024The mana value of a face-down creature is 0.