Devouring Rage 

Instant — Arcane
$0.16 #26176 0.45 21.9 years
As an additional cost to cast this spell, you may sacrifice any number of Spirits.
Target creature gets +3/+0 until end of turn. For each Spirit sacrificed this way, that creature gets an additional +3/+0 until end of turn.
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Apothecary Geist74%
$0.04↓#244560.71↑10.4 years↓
"When this creature enters, if you control another Spirit, you gain 3 life."
Dreamcatcher73%
$0.17↑#249870.20↓21.3 years
"Whenever you cast a Spirit or Arcane spell, you may sacrifice this creature. If you do, draw a card."
Vicious Betrayal72%
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"You may cast Spirit spells as though they had flash."
+1 more matching line
Aegis of the Heavens72%
$0.19↑#13859↑0.19↓8.1 years↓
"Target creature gets +1/+7 until end of turn."