Cheapest priced copy (Jumpstart): $0.35 at Card Kingdom, near mint, their price list as of .
Blindblast 
Instant · Common · War of the Spark · #114
Blindblast deals 1 damage to target creature. That creature can't block this turn.
Draw a card.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Jumpstart | 295 | Common | $0.35 | — |
| The List | WAR-114 | Common | $0.35 | — |
| War of the Spark | 114 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 3 May 2019Casting Blindblast after a creature has blocked won’t remove the blocking creature from combat unless the damage Blindblast deals causes that creature to die. It won’t cause the creature it blocked to become unblocked even if the blocking creature does die.
- 3 May 2019If the target creature is an illegal target by the time Blindblast tries to resolve, the spell doesn’t resolve. You won’t draw a card.