Cheapest priced copy (The List): $0.35 at Card Kingdom, near mint, their price list as of .
Soltari Trooper 
Creature — Soltari Soldier · 1/1 · Common · Tempest · #47
Shadow (This creature can block or be blocked by only creatures with shadow.)
Whenever this creature attacks, it gets +1/+1 until end of turn.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
2 printings · $0.35 at Card Kingdom
3 rulings from Wizards of the Coast
- 19 March 2021If an attacking creature has multiple evasion abilities, such as shadow and flying, a creature can block it only if that creature satisfies all of the appropriate evasion abilities.
- 19 March 2021Once a creature has been blocked, that creature remains blocked and will deal and be dealt combat damage even if it gains or loses shadow or if the blocking creature gains or loses shadow.
- 19 March 2021Multiple instances of shadow on the same creature are redundant.