Blast-Furnace Hellkite 
Creature — Dragon
$4.21 #4233 0.51 3.9 years
Artifact offering (You may cast this spell as though it had flash by sacrificing an artifact and paying the difference in mana costs between this and the sacrificed artifact. Mana cost includes color.)
Flying, double strike
Creatures attacking your opponents have double strike.
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"Whenever you attack, creatures you control with counters on them gain double strike until end of turn."