Cheapest priced copy (Morningtide): $0.35 at Card Kingdom, near mint, their price list as of .
Cenn's Tactician 
Creature — Kithkin Soldier · 1/1 · Uncommon · Morningtide · #5
{W}, {T}: Put a +1/+1 counter on target Soldier creature.
Each creature you control with a +1/+1 counter on it can block an additional creature each combat.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $1.29 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| DCI Promos | 14 | Rare | — | $1.29 |
| Morningtide | 5 | Uncommon | $0.35 | $0.99 |
One ruling from Wizards of the Coast
- 1 April 2008The second ability is cumulative. That is, each creature you control with any +1/+1 counters on it can block an additional creature for each Cenn’s Tactician you control. Cenn’s Tactician doesn’t care whether the creature has any +1/+1 counters on it beyond the first.