Conclave's Blessing 

Enchantment — Aura
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
Enchant creature
Enchanted creature gets +0/+2 for each other creature you control.
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Cards that do something similar expected a card that isn't here?
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Bravado 99%
$0.31#13625
"Enchanted creature gets +1/+1 for each other creature you control."
+1 more matching line
Vampirism 99%
$0.25#26400
"Enchanted creature gets +1/+1 for each other creature you control."
+1 more matching line
Sigil of the Nayan Gods 90%
$0.30#19028
"Enchanted creature gets +1/+1 for each creature you control."
+1 more matching line
Gleam of Authority 85%
$0.35#16881
"Enchanted creature gets +1/+1 for each +1/+1 counter on other creatures you control."
+1 more matching line