Cheapest priced copy (Visions): $0.35 at Card Kingdom, near mint, their price list as of .
Heat Wave 
Enchantment · Uncommon · Visions · #83
Cumulative upkeep {R} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
Blue creatures can't block creatures you control.
Nonblue creatures can't block creatures you control unless their controller pays 1 life for each blocking creature they control.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Visions | 83 | Uncommon | $0.35 | — |