Heat Wave

Enchantment, 2R (3)
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 he or she controls.¹
Illus. Alan Rabinowitz

Format Legality	Legal in Vintage, Legacy, MTGO Classic Banned in Extended, Standard
Printings (1/6)	Visions (Uncommon)